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.

Saturday, 22 July 2017

14:40 UTC

Space Weather Message Code: WARK04
Serial Number: 3257
Issue Time: 2017 Jul 22 1440 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3256
Valid From: 2017 Jul 21 0212 UTC
Now Valid Until: 2017 Jul 23 0600 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.

11:42 UTC

Space Weather Message Code: ALTK05
Serial Number: 1127
Issue Time: 2017 Jul 22 1142 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 22 1142 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.

10:29 UTC

Space Weather Message Code: WARK05
Serial Number: 1369
Issue Time: 2017 Jul 22 1029 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jul 22 1028 UTC
Valid To: 2017 Jul 22 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.

10:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2617
Issue Time: 2017 Jul 22 1005 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2616
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 1273 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.

05:29 UTC

Space Weather Message Code: WARK04
Serial Number: 3256
Issue Time: 2017 Jul 22 0529 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3255
Valid From: 2017 Jul 21 0212 UTC
Now Valid Until: 2017 Jul 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 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, 21 July 2017

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 3255
Issue Time: 2017 Jul 21 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3254
Valid From: 2017 Jul 21 0212 UTC
Now Valid Until: 2017 Jul 22 0600 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: ALTEF3
Serial Number: 2616
Issue Time: 2017 Jul 21 1442 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2615
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 11444 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.

13:56 UTC

Space Weather Message Code: WARK04
Serial Number: 3254
Issue Time: 2017 Jul 21 1356 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3253
Valid From: 2017 Jul 21 0212 UTC
Now Valid Until: 2017 Jul 21 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.

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3253
Issue Time: 2017 Jul 21 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3252
Valid From: 2017 Jul 21 0212 UTC
Now Valid Until: 2017 Jul 21 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.

02:33 UTC

Space Weather Message Code: ALTK04
Serial Number: 1990
Issue Time: 2017 Jul 21 0233 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 21 0232 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.

02:14 UTC

Space Weather Message Code: WARK04
Serial Number: 3252
Issue Time: 2017 Jul 21 0214 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 21 0212 UTC
Valid To: 2017 Jul 21 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, 20 July 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2615
Issue Time: 2017 Jul 20 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2614
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 13630 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, 19 July 2017

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2614
Issue Time: 2017 Jul 19 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2613
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 5472 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, 18 July 2017

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3251
Issue Time: 2017 Jul 18 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3250
Valid From: 2017 Jul 16 0520 UTC
Now Valid Until: 2017 Jul 18 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.

05:21 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2613
Issue Time: 2017 Jul 18 0521 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2612
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 12226 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 July 2017

22:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3250
Issue Time: 2017 Jul 17 2255 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3249
Valid From: 2017 Jul 16 0520 UTC
Now Valid Until: 2017 Jul 18 0600 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.

16:42 UTC

Space Weather Message Code: ALTK06
Serial Number: 438
Issue Time: 2017 Jul 17 1642 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Jul 17 1642 UTC
Synoptic Period: 1500-1800 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.

16:27 UTC

Space Weather Message Code: WARK06
Serial Number: 390
Issue Time: 2017 Jul 17 1627 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Jul 17 1626 UTC
Valid To: 2017 Jul 17 2100 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.

16:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1126
Issue Time: 2017 Jul 17 1607 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 17 1607 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.

15:37 UTC

Space Weather Message Code: WARK04
Serial Number: 3249
Issue Time: 2017 Jul 17 1537 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3248
Valid From: 2017 Jul 16 0520 UTC
Now Valid Until: 2017 Jul 17 2300 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.

15:37 UTC

Space Weather Message Code: WARK05
Serial Number: 1368
Issue Time: 2017 Jul 17 1537 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jul 17 1536 UTC
Valid To: 2017 Jul 17 2100 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.

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3248
Issue Time: 2017 Jul 17 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3247
Valid From: 2017 Jul 16 0520 UTC
Now Valid Until: 2017 Jul 17 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.

05:28 UTC

Space Weather Message Code: WARK05
Serial Number: 1367
Issue Time: 2017 Jul 17 0528 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1366
Valid From: 2017 Jul 16 0520 UTC
Now Valid Until: 2017 Jul 17 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.

03:42 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2612
Issue Time: 2017 Jul 17 0342 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Jul 17 0325 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.

Sunday, 16 July 2017

21:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1125
Issue Time: 2017 Jul 16 2155 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 16 2150 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.

20:23 UTC

Space Weather Message Code: WARK05
Serial Number: 1366
Issue Time: 2017 Jul 16 2023 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1365
Valid From: 2017 Jul 16 0520 UTC
Now Valid Until: 2017 Jul 17 0600 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.

19:58 UTC

Space Weather Message Code: ALTK06
Serial Number: 437
Issue Time: 2017 Jul 16 1958 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Jul 16 1957 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.

19:50 UTC

Space Weather Message Code: WARK06
Serial Number: 389
Issue Time: 2017 Jul 16 1950 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Jul 16 1950 UTC
Valid To: 2017 Jul 17 0300 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.

16:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1124
Issue Time: 2017 Jul 16 1655 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 16 1654 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.

14:55 UTC

Space Weather Message Code: ALTK06
Serial Number: 436
Issue Time: 2017 Jul 16 1455 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Jul 16 1454 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.

13:09 UTC

Space Weather Message Code: ALTK05
Serial Number: 1123
Issue Time: 2017 Jul 16 1309 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 16 1308 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.

11:06 UTC

Space Weather Message Code: ALTK05
Serial Number: 1122
Issue Time: 2017 Jul 16 1106 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 16 1105 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.

10:38 UTC

Space Weather Message Code: WARK06
Serial Number: 388
Issue Time: 2017 Jul 16 1038 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Jul 16 1040 UTC
Valid To: 2017 Jul 16 1800 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.

06:09 UTC

Space Weather Message Code: SUMSUD
Serial Number: 222
Issue Time: 2017 Jul 16 0609 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2017 Jul 16 0601 UTC
Deviation: 40 nT
Station: HAD

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

06:07 UTC

Space Weather Message Code: ALTK04
Serial Number: 1989
Issue Time: 2017 Jul 16 0607 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 16 0604 UTC
Synoptic Period: 0600-0900 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.

05:24 UTC

Space Weather Message Code: WARSUD
Serial Number: 176
Issue Time: 2017 Jul 16 0524 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2017 Jul 16 0530 UTC
Valid To: 2017 Jul 16 0630 UTC
IP Shock Passage Observed: 2017 Jul 16 0515 UTC

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

05:23 UTC

Space Weather Message Code: WARK04
Serial Number: 3247
Issue Time: 2017 Jul 16 0523 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 16 0520 UTC
Valid To: 2017 Jul 17 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.

05:21 UTC

Space Weather Message Code: WARK05
Serial Number: 1365
Issue Time: 2017 Jul 16 0521 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jul 16 0520 UTC
Valid To: 2017 Jul 16 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.

Saturday, 15 July 2017

21:00 UTC

Space Weather Message Code: SUMPX1
Serial Number: 83
Issue Time: 2017 Jul 15 2100 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2017 Jul 14 0900 UTC
Maximum Time: 2017 Jul 14 2320 UTC
End Time: 2017 Jul 15 1115 UTC
Maximum 10MeV Flux: 22 pfu
NOAA Scale: S1 - Minor

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

11:24 UTC

Space Weather Message Code: WARPX1
Serial Number: 461
Issue Time: 2017 Jul 15 1124 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 460
Valid From: 2017 Jul 14 0530 UTC
Now Valid Until: 2017 Jul 15 2100 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

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

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Friday, 14 July 2017

17:55 UTC

Space Weather Message Code: WARPX1
Serial Number: 460
Issue Time: 2017 Jul 14 1755 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 459
Valid From: 2017 Jul 14 0530 UTC
Now Valid Until: 2017 Jul 15 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

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

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

10:29 UTC

Space Weather Message Code: WATA30
Serial Number: 161
Issue Time: 2017 Jul 14 1029 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Jul 15:  None (Below G1)   Jul 16:  G2 (Moderate)   Jul 17:  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.

09:19 UTC

Space Weather Message Code: ALTPX1
Serial Number: 315
Issue Time: 2017 Jul 14 0919 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2017 Jul 14 0900 UTC
NOAA Scale: S1 - Minor

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

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

05:30 UTC

Space Weather Message Code: WARPX1
Serial Number: 459
Issue Time: 2017 Jul 14 0530 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2017 Jul 14 0530 UTC
Valid To: 2017 Jul 14 1800 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

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

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

02:35 UTC

Space Weather Message Code: ALTTP4
Serial Number: 536
Issue Time: 2017 Jul 14 0235 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Jul 14 0202 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.

02:31 UTC

Space Weather Message Code: SUM10R
Serial Number: 692
Issue Time: 2017 Jul 14 0231 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2017 Jul 14 0110 UTC
Maximum Time: 2017 Jul 14 0151 UTC
End Time: 2017 Jul 14 0154 UTC
Duration: 44 minutes
Peak Flux: 130 sfu
Latest Penticton Noon Flux: 92 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.

Thursday, 13 July 2017

20:49 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1054
Issue Time: 2017 Jul 13 2049 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Jul 13 2006 UTC
Estimated Velocity: 770 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.

Sunday, 9 July 2017

23:47 UTC

Space Weather Message Code: WARK04
Serial Number: 3246
Issue Time: 2017 Jul 09 2347 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3245
Valid From: 2017 Jul 09 0023 UTC
Now Valid Until: 2017 Jul 10 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.

14:56 UTC

Space Weather Message Code: WARK04
Serial Number: 3245
Issue Time: 2017 Jul 09 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3244
Valid From: 2017 Jul 09 0023 UTC
Now Valid Until: 2017 Jul 09 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.

14:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1364
Issue Time: 2017 Jul 09 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1363
Valid From: 2017 Jul 09 0220 UTC
Now Valid Until: 2017 Jul 09 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 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.

10:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1121
Issue Time: 2017 Jul 09 1021 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 09 1020 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.

02:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1120
Issue Time: 2017 Jul 09 0230 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 09 0230 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.

02:21 UTC

Space Weather Message Code: WARK05
Serial Number: 1363
Issue Time: 2017 Jul 09 0221 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jul 09 0220 UTC
Valid To: 2017 Jul 09 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.

02:09 UTC

Space Weather Message Code: ALTK04
Serial Number: 1988
Issue Time: 2017 Jul 09 0209 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 09 0206 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.

00:24 UTC

Space Weather Message Code: WARK04
Serial Number: 3244
Issue Time: 2017 Jul 09 0024 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 09 0023 UTC
Valid To: 2017 Jul 09 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.

Thursday, 6 July 2017

20:34 UTC

Space Weather Message Code: WATA20
Serial Number: 792
Issue Time: 2017 Jul 06 2034 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 07:  None (Below G1)   Jul 08:  None (Below G1)   Jul 09:  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.

Monday, 3 July 2017

14:11 UTC

Space Weather Message Code: WATA20
Serial Number: 791
Issue Time: 2017 Jul 03 1411 UTC

CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 790
Original Issue Time: 2017 Jul 01 1954 UTC

Comment: Solar wind parameters have returned to nominal levels following the passage of the 28 June CME and G1 (Minor) storm conditions are no longer likely.

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, 2 July 2017

14:56 UTC

Space Weather Message Code: WARK04
Serial Number: 3243
Issue Time: 2017 Jul 02 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3242
Valid From: 2017 Jul 01 1640 UTC
Now Valid Until: 2017 Jul 03 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.

09:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1119
Issue Time: 2017 Jul 02 0900 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jul 02 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.

06:42 UTC

Space Weather Message Code: ALTK04
Serial Number: 1987
Issue Time: 2017 Jul 02 0642 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 02 0642 UTC
Synoptic Period: 0600-0900 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.

06:37 UTC

Space Weather Message Code: WARK05
Serial Number: 1362
Issue Time: 2017 Jul 02 0637 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jul 02 0630 UTC
Valid To: 2017 Jul 02 1300 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.

06:37 UTC

Space Weather Message Code: WARK04
Serial Number: 3242
Issue Time: 2017 Jul 02 0637 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3241
Valid From: 2017 Jul 01 1640 UTC
Now Valid Until: 2017 Jul 02 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.

Saturday, 1 July 2017

23:59 UTC

Space Weather Message Code: WARK04
Serial Number: 3241
Issue Time: 2017 Jul 01 2359 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3240
Valid From: 2017 Jul 01 1640 UTC
Now Valid Until: 2017 Jul 02 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.

19:54 UTC

Space Weather Message Code: WATA20
Serial Number: 790
Issue Time: 2017 Jul 01 1954 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 02:  G1 (Minor)   Jul 03:  G1 (Minor)   Jul 04:  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.

17:35 UTC

Space Weather Message Code: SUMSUD
Serial Number: 221
Issue Time: 2017 Jul 01 1735 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2017 Jul 01 1712 UTC
Deviation: 20 nT
Station: CMO

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

16:51 UTC

Space Weather Message Code: WARSUD
Serial Number: 175
Issue Time: 2017 Jul 01 1651 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2017 Jul 01 1715 UTC
Valid To: 2017 Jul 01 1745 UTC
IP Shock Passage Observed: 2017 Jul 01 1625 UTC

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

16:41 UTC

Space Weather Message Code: WARK04
Serial Number: 3240
Issue Time: 2017 Jul 01 1641 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 01 1640 UTC
Valid To: 2017 Jul 01 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.

05:33 UTC

Space Weather Message Code: WARK04
Serial Number: 3239
Issue Time: 2017 Jul 01 0533 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 01 0532 UTC
Valid To: 2017 Jul 01 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.

Friday, 30 June 2017

15:18 UTC

Space Weather Message Code: WATA20
Serial Number: 789
Issue Time: 2017 Jun 30 1518 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 01:  None (Below G1)   Jul 02:  None (Below G1)   Jul 03:  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.

Sunday, 25 June 2017

08:13 UTC

Space Weather Message Code: ALTK04
Serial Number: 1986
Issue Time: 2017 Jun 25 0813 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 25 0813 UTC
Synoptic Period: 0600-0900 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.

08:08 UTC

Space Weather Message Code: WARK04
Serial Number: 3238
Issue Time: 2017 Jun 25 0808 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 25 0808 UTC
Valid To: 2017 Jun 25 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.
Current data suggest that it is not possible to see aurora now at middle latitudes
The solar wind speed is currently moderately high (587.5 km/sec.)

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 25% 40%
Middle latitude 10% 1%
Predicted Kp max 4
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
Waning Crescent

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Space weather facts

Last X-flare:2015/05/05X2.7
Last M-flare:2017/07/14M2.4
Last geomagnetic storm:2017/07/17Kp6 (G2)
Number of spotless days in 2017:48
Current stretch spotless days:5

This day in history*

Solar flares
12004M9.1
22000M3.7
32004M1.6
42004M1.2
52000M1.0
ApG
1200431G3
2199925G1
3200924G2
4200216
5200512
*since 1994