NOAA SWPC Alerts, Watches and Warnings

The National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) is the official space weather government agency from the United States that provides alerts, watches and warning for space weather disturbances. Below you will find the latest space weather alerts, watches and warnings issued by the NOAA SWPC.

Tuesday, 25 April 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2590
Issue Time: 2017 Apr 25 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2589
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 54299 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 24 April 2017

08:48 UTC

Space Weather Message Code: WARK04
Serial Number: 3214
Issue Time: 2017 Apr 24 0848 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3213
Valid From: 2017 Apr 21 1546 UTC
Now Valid Until: 2017 Apr 25 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:42 UTC

Space Weather Message Code: WARK05
Serial Number: 1351
Issue Time: 2017 Apr 24 0842 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1350
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 24 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2589
Issue Time: 2017 Apr 24 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2588
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 20545 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

02:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1350
Issue Time: 2017 Apr 24 0256 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1349
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 24 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Sunday, 23 April 2017

18:21 UTC

Space Weather Message Code: WARK05
Serial Number: 1349
Issue Time: 2017 Apr 23 1821 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1348
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 24 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

18:21 UTC

Space Weather Message Code: WATA20
Serial Number: 783
Issue Time: 2017 Apr 23 1821 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 24:  G1 (Minor)   Apr 25:  G1 (Minor)   Apr 26:  G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

18:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1110
Issue Time: 2017 Apr 23 1802 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 23 1759 UTC
Synoptic Period: 1500-1800 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:44 UTC

Space Weather Message Code: ALTK05
Serial Number: 1109
Issue Time: 2017 Apr 23 1444 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 23 1442 UTC
Synoptic Period: 1200-1500 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:34 UTC

Space Weather Message Code: ALTK05
Serial Number: 1108
Issue Time: 2017 Apr 23 1034 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 23 1034 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:52 UTC

Space Weather Message Code: WARK06
Serial Number: 385
Issue Time: 2017 Apr 23 0852 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 384
Valid From: 2017 Apr 22 2255 UTC
Now Valid Until: 2017 Apr 23 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

08:52 UTC

Space Weather Message Code: WARK05
Serial Number: 1348
Issue Time: 2017 Apr 23 0852 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1347
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 23 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:52 UTC

Space Weather Message Code: WARK04
Serial Number: 3213
Issue Time: 2017 Apr 23 0852 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3212
Valid From: 2017 Apr 21 1546 UTC
Now Valid Until: 2017 Apr 24 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:52 UTC

Space Weather Message Code: ALTK06
Serial Number: 431
Issue Time: 2017 Apr 23 0852 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Apr 23 0852 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

07:54 UTC

Space Weather Message Code: ALTK05
Serial Number: 1107
Issue Time: 2017 Apr 23 0754 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 23 0754 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2588
Issue Time: 2017 Apr 23 0351 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2587
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 7467 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

00:01 UTC

Space Weather Message Code: ALTK06
Serial Number: 430
Issue Time: 2017 Apr 23 0001 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Apr 22 2359 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Saturday, 22 April 2017

22:55 UTC

Space Weather Message Code: WARK06
Serial Number: 384
Issue Time: 2017 Apr 22 2255 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Apr 22 2255 UTC
Valid To: 2017 Apr 23 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:40 UTC

Space Weather Message Code: ALTK05
Serial Number: 1106
Issue Time: 2017 Apr 22 2240 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 2240 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

20:46 UTC

Space Weather Message Code: WATA30
Serial Number: 155
Issue Time: 2017 Apr 22 2046 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 23:  G2 (Moderate)   Apr 24:  G1 (Minor)   Apr 25:  G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

20:46 UTC

Space Weather Message Code: WARK05
Serial Number: 1347
Issue Time: 2017 Apr 22 2046 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1346
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 23 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:47 UTC

Space Weather Message Code: ALTK05
Serial Number: 1105
Issue Time: 2017 Apr 22 1647 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 1641 UTC
Synoptic Period: 1500-1800 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:26 UTC

Space Weather Message Code: WARK06
Serial Number: 383
Issue Time: 2017 Apr 22 1426 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 382
Valid From: 2017 Apr 22 0245 UTC
Now Valid Until: 2017 Apr 22 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

14:26 UTC

Space Weather Message Code: ALTK06
Serial Number: 429
Issue Time: 2017 Apr 22 1426 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Apr 22 1425 UTC
Synoptic Period: 1200-1500 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:56 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2587
Issue Time: 2017 Apr 22 1356 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2586
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 2805 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

13:48 UTC

Space Weather Message Code: ALTK05
Serial Number: 1104
Issue Time: 2017 Apr 22 1348 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 1346 UTC
Synoptic Period: 1200-1500 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:58 UTC

Space Weather Message Code: WARK06
Serial Number: 382
Issue Time: 2017 Apr 22 1058 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 381
Valid From: 2017 Apr 22 0245 UTC
Now Valid Until: 2017 Apr 22 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:58 UTC

Space Weather Message Code: WARK05
Serial Number: 1346
Issue Time: 2017 Apr 22 1058 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1345
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 22 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:22 UTC

Space Weather Message Code: ALTK05
Serial Number: 1103
Issue Time: 2017 Apr 22 1022 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 1022 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:52 UTC

Space Weather Message Code: WARK06
Serial Number: 381
Issue Time: 2017 Apr 22 0852 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 380
Valid From: 2017 Apr 22 0245 UTC
Now Valid Until: 2017 Apr 22 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

08:52 UTC

Space Weather Message Code: ALTK05
Serial Number: 1102
Issue Time: 2017 Apr 22 0852 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 0852 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:59 UTC

Space Weather Message Code: ALTK06
Serial Number: 428
Issue Time: 2017 Apr 22 0559 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Apr 22 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

05:59 UTC

Space Weather Message Code: WARK06
Serial Number: 380
Issue Time: 2017 Apr 22 0559 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 379
Valid From: 2017 Apr 22 0245 UTC
Now Valid Until: 2017 Apr 22 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

05:59 UTC

Space Weather Message Code: WARK05
Serial Number: 1345
Issue Time: 2017 Apr 22 0559 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1344
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 22 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:59 UTC

Space Weather Message Code: WARK04
Serial Number: 3212
Issue Time: 2017 Apr 22 0559 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3211
Valid From: 2017 Apr 21 1546 UTC
Now Valid Until: 2017 Apr 23 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

04:22 UTC

Space Weather Message Code: ALTK05
Serial Number: 1101
Issue Time: 2017 Apr 22 0422 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 0421 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:49 UTC

Space Weather Message Code: WARK06
Serial Number: 379
Issue Time: 2017 Apr 22 0249 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Apr 22 0245 UTC
Valid To: 2017 Apr 22 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

02:38 UTC

Space Weather Message Code: ALTK05
Serial Number: 1100
Issue Time: 2017 Apr 22 0238 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 22 0235 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1099
Issue Time: 2017 Apr 22 0001 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 21 2359 UTC
Synoptic Period: 2100-0000 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Friday, 21 April 2017

21:57 UTC

Space Weather Message Code: WARK05
Serial Number: 1344
Issue Time: 2017 Apr 21 2157 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1343
Valid From: 2017 Apr 21 1920 UTC
Now Valid Until: 2017 Apr 22 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

21:57 UTC

Space Weather Message Code: WARK04
Serial Number: 3211
Issue Time: 2017 Apr 21 2157 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3210
Valid From: 2017 Apr 21 1546 UTC
Now Valid Until: 2017 Apr 22 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

20:39 UTC

Space Weather Message Code: ALTK05
Serial Number: 1098
Issue Time: 2017 Apr 21 2039 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 21 2032 UTC
Synoptic Period: 1800-2100 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

19:25 UTC

Space Weather Message Code: WATA30
Serial Number: 154
Issue Time: 2017 Apr 21 1925 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 22:  G1 (Minor)   Apr 23:  G2 (Moderate)   Apr 24:  G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

19:24 UTC

Space Weather Message Code: WARK05
Serial Number: 1343
Issue Time: 2017 Apr 21 1924 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Apr 21 1920 UTC
Valid To: 2017 Apr 21 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:42 UTC

Space Weather Message Code: ALTK04
Serial Number: 1974
Issue Time: 2017 Apr 21 1642 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 21 1638 UTC
Synoptic Period: 1500-1800 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

15:48 UTC

Space Weather Message Code: WARK04
Serial Number: 3210
Issue Time: 2017 Apr 21 1548 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 21 1546 UTC
Valid To: 2017 Apr 21 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:47 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2586
Issue Time: 2017 Apr 21 1447 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Apr 21 1425 UTC
Station: GOES13
 

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Thursday, 20 April 2017

19:59 UTC

Space Weather Message Code: WATA30
Serial Number: 153
Issue Time: 2017 Apr 20 1959 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 21:  None (Below G1)   Apr 22:  None (Below G1)   Apr 23:  G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3209
Issue Time: 2017 Apr 20 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3208
Valid From: 2017 Apr 20 0105 UTC
Now Valid Until: 2017 Apr 20 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

12:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1097
Issue Time: 2017 Apr 20 1207 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 20 1159 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:38 UTC

Space Weather Message Code: WARK06
Serial Number: 378
Issue Time: 2017 Apr 20 1138 UTC

CANCEL WARNING: Geomagnetic K-Index of 6 expected
Cancel Serial Number: 377
Original Issue Time: 2017 Apr 20 0345 UTC

Comment: Conditions are no longer favorable for G2-Moderate storm levels

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

11:08 UTC

Space Weather Message Code: WARK04
Serial Number: 3208
Issue Time: 2017 Apr 20 1108 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3207
Valid From: 2017 Apr 20 0105 UTC
Now Valid Until: 2017 Apr 20 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

04:34 UTC

Space Weather Message Code: ALTK06
Serial Number: 427
Issue Time: 2017 Apr 20 0434 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Apr 20 0433 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:51 UTC

Space Weather Message Code: WARK05
Serial Number: 1342
Issue Time: 2017 Apr 20 0351 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1341
Valid From: 2017 Apr 20 0138 UTC
Now Valid Until: 2017 Apr 20 1500 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:47 UTC

Space Weather Message Code: WARK06
Serial Number: 377
Issue Time: 2017 Apr 20 0347 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 376
Valid From: 2017 Apr 20 0345 UTC
Now Valid Until: 2017 Apr 20 1500 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:46 UTC

Space Weather Message Code: WARK04
Serial Number: 3207
Issue Time: 2017 Apr 20 0346 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3206
Valid From: 2017 Apr 20 0105 UTC
Now Valid Until: 2017 Apr 20 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:45 UTC

Space Weather Message Code: WARK06
Serial Number: 376
Issue Time: 2017 Apr 20 0345 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Apr 20 0345 UTC
Valid To: 2017 Apr 20 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:37 UTC

Space Weather Message Code: ALTK05
Serial Number: 1096
Issue Time: 2017 Apr 20 0337 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 20 0336 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1095
Issue Time: 2017 Apr 20 0301 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 20 0259 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:38 UTC

Space Weather Message Code: WARK05
Serial Number: 1341
Issue Time: 2017 Apr 20 0138 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Apr 20 0138 UTC
Valid To: 2017 Apr 20 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:25 UTC

Space Weather Message Code: ALTK04
Serial Number: 1973
Issue Time: 2017 Apr 20 0125 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 20 0125 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

01:04 UTC

Space Weather Message Code: WARK04
Serial Number: 3206
Issue Time: 2017 Apr 20 0104 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 20 0105 UTC
Valid To: 2017 Apr 20 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Wednesday, 19 April 2017

06:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1094
Issue Time: 2017 Apr 19 0601 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 19 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:27 UTC

Space Weather Message Code: WARK05
Serial Number: 1340
Issue Time: 2017 Apr 19 0527 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Apr 19 0526 UTC
Valid To: 2017 Apr 19 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

04:49 UTC

Space Weather Message Code: ALTK04
Serial Number: 1972
Issue Time: 2017 Apr 19 0449 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 19 0449 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

00:56 UTC

Space Weather Message Code: WARK04
Serial Number: 3205
Issue Time: 2017 Apr 19 0056 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 19 0100 UTC
Valid To: 2017 Apr 19 1200 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Tuesday, 18 April 2017

21:09 UTC

Space Weather Message Code: ALTTP4
Serial Number: 535
Issue Time: 2017 Apr 18 2109 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Apr 18 1953 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

21:09 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1052
Issue Time: 2017 Apr 18 2109 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Apr 18 1949 UTC
Estimated Velocity: 631 km/s

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

12:41 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2585
Issue Time: 2017 Apr 18 1241 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2584
Begin Time: 2017 Apr 17 1210 UTC
Yesterday Maximum 2MeV Flux: 1717 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 17 April 2017

18:05 UTC

Space Weather Message Code: WATA20
Serial Number: 782
Issue Time: 2017 Apr 17 1805 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 18:  G1 (Minor)   Apr 19:  None (Below G1)   Apr 20:  None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

12:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2584
Issue Time: 2017 Apr 17 1231 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Apr 17 1210 UTC
Station: GOES13
 

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Saturday, 15 April 2017

15:46 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2583
Issue Time: 2017 Apr 15 1546 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2582
Begin Time: 2017 Apr 12 1115 UTC
Yesterday Maximum 2MeV Flux: 2534 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Friday, 14 April 2017

19:18 UTC

Space Weather Message Code: WATA20
Serial Number: 781
Issue Time: 2017 Apr 14 1918 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 15:  None (Below G1)   Apr 16:  None (Below G1)   Apr 17:  G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

12:48 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2582
Issue Time: 2017 Apr 14 1248 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2581
Begin Time: 2017 Apr 12 1115 UTC
Yesterday Maximum 2MeV Flux: 2552 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:47 UTC

Space Weather Message Code: WARK04
Serial Number: 3204
Issue Time: 2017 Apr 14 1147 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3203
Valid From: 2017 Apr 14 0135 UTC
Now Valid Until: 2017 Apr 14 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

06:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 1971
Issue Time: 2017 Apr 14 0601 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 14 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:57 UTC

Space Weather Message Code: WARK04
Serial Number: 3203
Issue Time: 2017 Apr 14 0557 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3202
Valid From: 2017 Apr 14 0135 UTC
Now Valid Until: 2017 Apr 14 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

01:33 UTC

Space Weather Message Code: WARK04
Serial Number: 3202
Issue Time: 2017 Apr 14 0133 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 14 0135 UTC
Valid To: 2017 Apr 14 0600 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Thursday, 13 April 2017

08:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2581
Issue Time: 2017 Apr 13 0851 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2580
Begin Time: 2017 Apr 12 1115 UTC
Yesterday Maximum 2MeV Flux: 1800 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Wednesday, 12 April 2017

11:27 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2580
Issue Time: 2017 Apr 12 1127 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Apr 12 1115 UTC
Station: GOES13
 

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

01:59 UTC

Space Weather Message Code: WARK04
Serial Number: 3201
Issue Time: 2017 Apr 12 0159 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 12 0200 UTC
Valid To: 2017 Apr 12 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Tuesday, 11 April 2017

14:54 UTC

Space Weather Message Code: WARK04
Serial Number: 3200
Issue Time: 2017 Apr 11 1454 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3199
Valid From: 2017 Apr 11 1030 UTC
Now Valid Until: 2017 Apr 11 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

12:03 UTC

Space Weather Message Code: ALTK04
Serial Number: 1970
Issue Time: 2017 Apr 11 1203 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 11 1159 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:30 UTC

Space Weather Message Code: WARK04
Serial Number: 3199
Issue Time: 2017 Apr 11 1030 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 11 1030 UTC
Valid To: 2017 Apr 11 1500 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Monday, 10 April 2017

11:21 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2579
Issue Time: 2017 Apr 10 1121 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2578
Begin Time: 2017 Apr 09 1330 UTC
Yesterday Maximum 2MeV Flux: 3029 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Sunday, 9 April 2017

13:46 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2578
Issue Time: 2017 Apr 09 1346 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Apr 09 1330 UTC
Station: GOES13
 

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

12:39 UTC

Space Weather Message Code: WARK04
Serial Number: 3198
Issue Time: 2017 Apr 09 1239 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3197
Valid From: 2017 Apr 07 2348 UTC
Now Valid Until: 2017 Apr 10 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:42 UTC

Space Weather Message Code: WARK05
Serial Number: 1339
Issue Time: 2017 Apr 09 0542 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1338
Valid From: 2017 Apr 09 0130 UTC
Now Valid Until: 2017 Apr 09 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

04:58 UTC

Space Weather Message Code: ALTK05
Serial Number: 1093
Issue Time: 2017 Apr 09 0458 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 09 0458 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:30 UTC

Space Weather Message Code: WARK04
Serial Number: 3197
Issue Time: 2017 Apr 09 0130 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3195
Valid From: 2017 Apr 07 2348 UTC
Now Valid Until: 2017 Apr 09 1300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

01:30 UTC

Space Weather Message Code: WARK05
Serial Number: 1338
Issue Time: 2017 Apr 09 0130 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Apr 09 0130 UTC
Valid To: 2017 Apr 09 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Saturday, 8 April 2017

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3195
Issue Time: 2017 Apr 08 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3194
Valid From: 2017 Apr 07 2348 UTC
Now Valid Until: 2017 Apr 09 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:34 UTC

Space Weather Message Code: WARK04
Serial Number: 3194
Issue Time: 2017 Apr 08 0834 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3193
Valid From: 2017 Apr 07 2348 UTC
Now Valid Until: 2017 Apr 08 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Friday, 7 April 2017

23:55 UTC

Space Weather Message Code: ALTK04
Serial Number: 1969
Issue Time: 2017 Apr 07 2355 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 07 2355 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

23:49 UTC

Space Weather Message Code: WARK04
Serial Number: 3193
Issue Time: 2017 Apr 07 2349 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 07 2348 UTC
Valid To: 2017 Apr 08 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Thursday, 6 April 2017

00:06 UTC

Space Weather Message Code: ALTK04
Serial Number: 1968
Issue Time: 2017 Apr 06 0006 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 05 2359 UTC
Synoptic Period: 2100-0000 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Wednesday, 5 April 2017

22:50 UTC

Space Weather Message Code: WARK04
Serial Number: 3192
Issue Time: 2017 Apr 05 2250 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 05 2250 UTC
Valid To: 2017 Apr 06 0300 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Tuesday, 4 April 2017

21:55 UTC

Space Weather Message Code: SUM10R
Serial Number: 691
Issue Time: 2017 Apr 04 2155 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2017 Apr 04 2134 UTC
Maximum Time: 2017 Apr 04 2134 UTC
End Time: 2017 Apr 04 2136 UTC
Duration: 2 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 94 sfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3191
Issue Time: 2017 Apr 04 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3190
Valid From: 2017 Apr 04 0440 UTC
Now Valid Until: 2017 Apr 04 2100 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

11:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 1092
Issue Time: 2017 Apr 04 1152 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 04 1152 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:15 UTC

Space Weather Message Code: ALTK05
Serial Number: 1091
Issue Time: 2017 Apr 04 0815 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Apr 04 0814 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:34 UTC

Space Weather Message Code: WARK05
Serial Number: 1335
Issue Time: 2017 Apr 04 0734 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Apr 04 0733 UTC
Valid To: 2017 Apr 04 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:34 UTC

Space Weather Message Code: WARK04
Serial Number: 3190
Issue Time: 2017 Apr 04 0734 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3189
Valid From: 2017 Apr 04 0440 UTC
Now Valid Until: 2017 Apr 04 1500 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

06:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 1967
Issue Time: 2017 Apr 04 0601 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Apr 04 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:44 UTC

Space Weather Message Code: SUM10R
Serial Number: 690
Issue Time: 2017 Apr 04 0544 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2017 Apr 04 0520 UTC
Maximum Time: 2017 Apr 04 0520 UTC
End Time: 2017 Apr 04 0520 UTC
Duration: 1 minutes
Peak Flux: 160 sfu
Latest Penticton Noon Flux: 108 sfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

04:39 UTC

Space Weather Message Code: WARK04
Serial Number: 3189
Issue Time: 2017 Apr 04 0439 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Apr 04 0440 UTC
Valid To: 2017 Apr 04 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Monday, 3 April 2017

18:04 UTC

Space Weather Message Code: ALTTP4
Serial Number: 534
Issue Time: 2017 Apr 03 1804 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Apr 03 1432 UTC

Comment: Delayed transmission due to comm problems

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

18:03 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1051
Issue Time: 2017 Apr 03 1803 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Apr 03 1429 UTC
Estimated Velocity: 746 km/s

Comment: Delayed transmission due to comm problems

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

14:47 UTC

Space Weather Message Code: SUMXM5
Serial Number: 149
Issue Time: 2017 Apr 03 1447 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2017 Apr 03 1419 UTC
Maximum Time: 2017 Apr 03 1429 UTC
End Time: 2017 Apr 03 1434 UTC
X-ray Class: M5.8
Location: N12W71
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

14:33 UTC

Space Weather Message Code: ALTXMF
Serial Number: 266
Issue Time: 2017 Apr 03 1433 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2017 Apr 03 1429 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2577
Issue Time: 2017 Apr 03 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2576
Begin Time: 2017 Mar 28 1045 UTC
Yesterday Maximum 2MeV Flux: 62136 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Sunday, 2 April 2017

20:46 UTC

Space Weather Message Code: SUMXM5
Serial Number: 148
Issue Time: 2017 Apr 02 2046 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2017 Apr 02 2026 UTC
Maximum Time: 2017 Apr 02 2033 UTC
End Time: 2017 Apr 02 2038 UTC
X-ray Class: M5.7
Location: N12W60
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

20:34 UTC

Space Weather Message Code: ALTXMF
Serial Number: 265
Issue Time: 2017 Apr 02 2034 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2017 Apr 02 2032 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

13:08 UTC

Space Weather Message Code: SUM10R
Serial Number: 689
Issue Time: 2017 Apr 02 1308 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2017 Apr 02 1256 UTC
Maximum Time: 2017 Apr 02 1257 UTC
End Time: 2017 Apr 02 1257 UTC
Duration: 1 minutes
Peak Flux: 110 sfu
Latest Penticton Noon Flux: 101 sfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

09:01 UTC

Space Weather Message Code: SUMXM5
Serial Number: 147
Issue Time: 2017 Apr 02 0901 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2017 Apr 02 0750 UTC
Maximum Time: 2017 Apr 02 0802 UTC
End Time: 2017 Apr 02 0813 UTC
X-ray Class: M5.3
Optical Class: 2n
Location: N12W59
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

08:33 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1050
Issue Time: 2017 Apr 02 0833 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Apr 02 0807 UTC
Estimated Velocity: 628 km/s

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

08:17 UTC

Space Weather Message Code: ALTTP4
Serial Number: 533
Issue Time: 2017 Apr 02 0817 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Apr 02 0800 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

08:01 UTC

Space Weather Message Code: ALTXMF
Serial Number: 264
Issue Time: 2017 Apr 02 0801 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2017 Apr 02 0800 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2576
Issue Time: 2017 Apr 02 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2575
Begin Time: 2017 Mar 28 1045 UTC
Yesterday Maximum 2MeV Flux: 41365 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

02:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3188
Issue Time: 2017 Apr 02 0255 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3187
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Apr 02 1300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Saturday, 1 April 2017

23:21 UTC

Space Weather Message Code: ALTTP4
Serial Number: 532
Issue Time: 2017 Apr 01 2321 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Apr 01 2150 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3187
Issue Time: 2017 Apr 01 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3186
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Apr 02 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

11:08 UTC

Space Weather Message Code: WARK04
Serial Number: 3186
Issue Time: 2017 Apr 01 1108 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3185
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Apr 01 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2575
Issue Time: 2017 Apr 01 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2574
Begin Time: 2017 Mar 28 1045 UTC
Yesterday Maximum 2MeV Flux: 24539 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Friday, 31 March 2017

20:08 UTC

Space Weather Message Code: WATA20
Serial Number: 779
Issue Time: 2017 Mar 31 2008 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 01:  G1 (Minor)   Apr 02:  None (Below G1)   Apr 03:  None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3185
Issue Time: 2017 Mar 31 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3184
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Apr 01 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:55 UTC

Space Weather Message Code: WARK05
Serial Number: 1334
Issue Time: 2017 Mar 31 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1333
Valid From: 2017 Mar 30 2225 UTC
Now Valid Until: 2017 Apr 01 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

09:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1090
Issue Time: 2017 Mar 31 0901 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 31 0859 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

06:28 UTC

Space Weather Message Code: ALTTP4
Serial Number: 531
Issue Time: 2017 Mar 31 0628 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Mar 31 0550 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

06:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1089
Issue Time: 2017 Mar 31 0601 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 31 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1333
Issue Time: 2017 Mar 31 0543 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1332
Valid From: 2017 Mar 30 2225 UTC
Now Valid Until: 2017 Mar 31 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:43 UTC

Space Weather Message Code: WARK04
Serial Number: 3184
Issue Time: 2017 Mar 31 0543 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3183
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 31 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:09 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2574
Issue Time: 2017 Mar 31 0509 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2573
Begin Time: 2017 Mar 28 1045 UTC
Yesterday Maximum 2MeV Flux: 24432 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

03:08 UTC

Space Weather Message Code: ALTK05
Serial Number: 1088
Issue Time: 2017 Mar 31 0308 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 31 0259 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1087
Issue Time: 2017 Mar 31 0003 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 30 2359 UTC
Synoptic Period: 2100-0000 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Thursday, 30 March 2017

22:22 UTC

Space Weather Message Code: WARK04
Serial Number: 3183
Issue Time: 2017 Mar 30 2222 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3182
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 31 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

22:22 UTC

Space Weather Message Code: WARK05
Serial Number: 1332
Issue Time: 2017 Mar 30 2222 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Mar 30 2225 UTC
Valid To: 2017 Mar 31 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3182
Issue Time: 2017 Mar 30 1145 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3181
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 30 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

06:06 UTC

Space Weather Message Code: ALTK05
Serial Number: 1086
Issue Time: 2017 Mar 30 0606 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 30 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:26 UTC

Space Weather Message Code: WARK05
Serial Number: 1330
Issue Time: 2017 Mar 30 0525 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Mar 30 0524 UTC
Valid To: 2017 Mar 30 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:14 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2573
Issue Time: 2017 Mar 30 0514 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2572
Begin Time: 2017 Mar 28 1045 UTC
Yesterday Maximum 2MeV Flux: 29503 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Wednesday, 29 March 2017

11:54 UTC

Space Weather Message Code: WARK04
Serial Number: 3181
Issue Time: 2017 Mar 29 1154 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3180
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 30 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2572
Issue Time: 2017 Mar 29 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2571
Begin Time: 2017 Mar 28 1045 UTC
Yesterday Maximum 2MeV Flux: 14903 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Tuesday, 28 March 2017

23:43 UTC

Space Weather Message Code: WARK04
Serial Number: 3180
Issue Time: 2017 Mar 28 2343 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3179
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 29 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

11:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2571
Issue Time: 2017 Mar 28 1101 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Mar 28 1045 UTC
Station: GOES-13
 

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

04:08 UTC

Space Weather Message Code: ALTK05
Serial Number: 1085
Issue Time: 2017 Mar 28 0408 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 28 0405 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:40 UTC

Space Weather Message Code: WARK06
Serial Number: 375
Issue Time: 2017 Mar 28 0240 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 374
Valid From: 2017 Mar 27 1019 UTC
Now Valid Until: 2017 Mar 28 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

02:40 UTC

Space Weather Message Code: WARK04
Serial Number: 3179
Issue Time: 2017 Mar 28 0240 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3178
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 28 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:40 UTC

Space Weather Message Code: WARK05
Serial Number: 1329
Issue Time: 2017 Mar 28 0240 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1328
Valid From: 2017 Mar 27 0520 UTC
Now Valid Until: 2017 Mar 28 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:19 UTC

Space Weather Message Code: ALTK05
Serial Number: 1084
Issue Time: 2017 Mar 28 0119 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 28 0117 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:12 UTC

Space Weather Message Code: ALTK05
Serial Number: 1083
Issue Time: 2017 Mar 28 0012 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 2339 UTC
Synoptic Period: 2100-0000 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Monday, 27 March 2017

21:16 UTC

Space Weather Message Code: WATA30
Serial Number: 152
Issue Time: 2017 Mar 27 2116 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Mar 28:  G2 (Moderate)   Mar 29:  G2 (Moderate)   Mar 30:  G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

20:55 UTC

Space Weather Message Code: WARK06
Serial Number: 374
Issue Time: 2017 Mar 27 2055 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 373
Valid From: 2017 Mar 27 1019 UTC
Now Valid Until: 2017 Mar 28 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

19:48 UTC

Space Weather Message Code: ALTK06
Serial Number: 426
Issue Time: 2017 Mar 27 1948 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Mar 27 1948 UTC
Synoptic Period: 1800-2100 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

19:42 UTC

Space Weather Message Code: ALTK05
Serial Number: 1082
Issue Time: 2017 Mar 27 1942 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 1941 UTC
Synoptic Period: 1800-2100 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:34 UTC

Space Weather Message Code: ALTK05
Serial Number: 1081
Issue Time: 2017 Mar 27 1634 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 1633 UTC
Synoptic Period: 1500-1800 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:42 UTC

Space Weather Message Code: WARK04
Serial Number: 3178
Issue Time: 2017 Mar 27 1442 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3177
Valid From: 2017 Mar 27 0350 UTC
Now Valid Until: 2017 Mar 28 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:42 UTC

Space Weather Message Code: WARK05
Serial Number: 1328
Issue Time: 2017 Mar 27 1442 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1327
Valid From: 2017 Mar 27 0520 UTC
Now Valid Until: 2017 Mar 28 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:42 UTC

Space Weather Message Code: WARK06
Serial Number: 373
Issue Time: 2017 Mar 27 1442 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 372
Valid From: 2017 Mar 27 1019 UTC
Now Valid Until: 2017 Mar 27 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

14:09 UTC

Space Weather Message Code: ALTK05
Serial Number: 1080
Issue Time: 2017 Mar 27 1409 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 1408 UTC
Synoptic Period: 1200-1500 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:24 UTC

Space Weather Message Code: ALTK06
Serial Number: 425
Issue Time: 2017 Mar 27 1024 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Mar 27 1024 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:22 UTC

Space Weather Message Code: WARK06
Serial Number: 372
Issue Time: 2017 Mar 27 1022 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Mar 27 1019 UTC
Valid To: 2017 Mar 27 1459 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1079
Issue Time: 2017 Mar 27 1007 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 1005 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:40 UTC

Space Weather Message Code: ALTK05
Serial Number: 1078
Issue Time: 2017 Mar 27 0740 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 0735 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1077
Issue Time: 2017 Mar 27 0559 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Mar 27 0559 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:20 UTC

Space Weather Message Code: WARK05
Serial Number: 1327
Issue Time: 2017 Mar 27 0520 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Mar 27 0520 UTC
Valid To: 2017 Mar 27 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 1966
Issue Time: 2017 Mar 27 0500 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Mar 27 0459 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:51 UTC

Space Weather Message Code: WARK04
Serial Number: 3177
Issue Time: 2017 Mar 27 0351 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Mar 27 0350 UTC
Valid To: 2017 Mar 27 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Current data suggest that it is not possible to see aurora now at middle latitudes
The solar wind speed is currently moderately high (586.3 km/sec.)

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 25% 60%
Middle latitude 25% 1%
Predicted Kp max 5
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
New Moon

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Space weather facts

Last X-flare:2015/05/05X2.7
Last M-flare:2017/04/03M5.8
Last geomagnetic storm:2017/04/23Kp6 (G2)
Number of spotless days in 2017:30
Current stretch spotless days:2

This day in history*

Solar flares
12001M7.8
22003M7.0
32003M2.5
42003M2.1
52003M2.1
ApG
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4201216G1
5200315
*since 1994