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.

Sunday, 28 May 2017

14:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1356
Issue Time: 2017 May 28 1443 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1355
Valid From: 2017 May 27 2204 UTC
Now Valid Until: 2017 May 28 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.

10:26 UTC

Space Weather Message Code: ALTK05
Serial Number: 1115
Issue Time: 2017 May 28 1026 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 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.

08:24 UTC

Space Weather Message Code: ALTK06
Serial Number: 435
Issue Time: 2017 May 28 0824 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0823 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.

07:19 UTC

Space Weather Message Code: ALTK05
Serial Number: 1114
Issue Time: 2017 May 28 0719 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0718 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.

04:30 UTC

Space Weather Message Code: WARK04
Serial Number: 3225
Issue Time: 2017 May 28 0430 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3224
Valid From: 2017 May 27 1530 UTC
Now Valid Until: 2017 May 29 0000 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.

04:20 UTC

Space Weather Message Code: ALTK07
Serial Number: 105
Issue Time: 2017 May 28 0420 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2017 May 28 0419 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G3 - Strong

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

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

04:10 UTC

Space Weather Message Code: WARK05
Serial Number: 1355
Issue Time: 2017 May 28 0410 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1354
Valid From: 2017 May 27 2204 UTC
Now Valid Until: 2017 May 28 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.

04:10 UTC

Space Weather Message Code: WARK06
Serial Number: 387
Issue Time: 2017 May 28 0410 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 386
Valid From: 2017 May 27 2320 UTC
Now Valid Until: 2017 May 28 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 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.

04:10 UTC

Space Weather Message Code: WARK07
Serial Number: 69
Issue Time: 2017 May 28 0410 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2017 May 28 0409 UTC
Valid To: 2017 May 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater - Strong to Extreme

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

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

03:50 UTC

Space Weather Message Code: ALTK06
Serial Number: 434
Issue Time: 2017 May 28 0350 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0349 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.

03:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1113
Issue Time: 2017 May 28 0330 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0329 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.

02:25 UTC

Space Weather Message Code: ALTK06
Serial Number: 433
Issue Time: 2017 May 28 0225 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0224 UTC
Synoptic Period: 0000-0300 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.

01:06 UTC

Space Weather Message Code: ALTK05
Serial Number: 1112
Issue Time: 2017 May 28 0106 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0105 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.

Saturday, 27 May 2017

23:23 UTC

Space Weather Message Code: ALTK06
Serial Number: 432
Issue Time: 2017 May 27 2323 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 27 2322 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.

23:20 UTC

Space Weather Message Code: WARK06
Serial Number: 386
Issue Time: 2017 May 27 2320 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 May 27 2320 UTC
Valid To: 2017 May 28 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.

22:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1111
Issue Time: 2017 May 27 2255 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 27 2255 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.

22:04 UTC

Space Weather Message Code: WARK05
Serial Number: 1354
Issue Time: 2017 May 27 2204 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 May 27 2204 UTC
Valid To: 2017 May 28 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.

22:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 1979
Issue Time: 2017 May 27 2202 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 27 2202 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.

20:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3224
Issue Time: 2017 May 27 2045 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3223
Valid From: 2017 May 27 1530 UTC
Now Valid Until: 2017 May 28 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.

15:46 UTC

Space Weather Message Code: SUMSUD
Serial Number: 220
Issue Time: 2017 May 27 1546 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2017 May 27 1536 UTC
Deviation: 19 nT
Station: BOU

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

15:23 UTC

Space Weather Message Code: WARK04
Serial Number: 3223
Issue Time: 2017 May 27 1523 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 27 1530 UTC
Valid To: 2017 May 27 2100 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.

15:05 UTC

Space Weather Message Code: WARSUD
Serial Number: 174
Issue Time: 2017 May 27 1505 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2017 May 27 1545 UTC
Valid To: 2017 May 27 1630 UTC
IP Shock Passage Observed: 2017 May 27 1446 UTC

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

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2608
Issue Time: 2017 May 27 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2607
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 13745 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, 26 May 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2607
Issue Time: 2017 May 26 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2606
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 17618 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.

Thursday, 25 May 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2606
Issue Time: 2017 May 25 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2605
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 13965 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, 24 May 2017

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2605
Issue Time: 2017 May 24 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2604
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 9338 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, 23 May 2017

05:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3222
Issue Time: 2017 May 23 0545 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 23 0544 UTC
Valid To: 2017 May 23 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.

05:36 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2604
Issue Time: 2017 May 23 0536 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2603
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 26098 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, 22 May 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2603
Issue Time: 2017 May 22 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2602
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 13009 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, 21 May 2017

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3221
Issue Time: 2017 May 21 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3220
Valid From: 2017 May 19 1614 UTC
Now Valid Until: 2017 May 22 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.

06:39 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2602
Issue Time: 2017 May 21 0639 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2601
Begin Time: 2017 May 20 1705 UTC
Yesterday Maximum 2MeV Flux: 1718 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.

Saturday, 20 May 2017

17:20 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2601
Issue Time: 2017 May 20 1720 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 May 20 1705 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.

14:50 UTC

Space Weather Message Code: WARK05
Serial Number: 1353
Issue Time: 2017 May 20 1450 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1352
Valid From: 2017 May 20 0729 UTC
Now Valid Until: 2017 May 20 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.

07:30 UTC

Space Weather Message Code: WARK05
Serial Number: 1352
Issue Time: 2017 May 20 0730 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 May 20 0729 UTC
Valid To: 2017 May 20 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.

02:41 UTC

Space Weather Message Code: WARK04
Serial Number: 3220
Issue Time: 2017 May 20 0241 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3219
Valid From: 2017 May 19 1614 UTC
Now Valid Until: 2017 May 21 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.

02:40 UTC

Space Weather Message Code: ALTK04
Serial Number: 1978
Issue Time: 2017 May 20 0240 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 20 0235 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.

Friday, 19 May 2017

16:14 UTC

Space Weather Message Code: WARK04
Serial Number: 3219
Issue Time: 2017 May 19 1614 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 19 1614 UTC
Valid To: 2017 May 20 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, 18 May 2017

01:39 UTC

Space Weather Message Code: ALTK04
Serial Number: 1977
Issue Time: 2017 May 18 0139 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 18 0139 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.

01:19 UTC

Space Weather Message Code: WARK04
Serial Number: 3218
Issue Time: 2017 May 18 0119 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 18 0115 UTC
Valid To: 2017 May 18 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, 17 May 2017

17:52 UTC

Space Weather Message Code: WATA30
Serial Number: 160
Issue Time: 2017 May 17 1752 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 18:  G1 (Minor)   May 19:  G2 (Moderate)   May 20:  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.

17:48 UTC

Space Weather Message Code: WATA30
Serial Number: 159
Issue Time: 2017 May 17 1748 UTC

CANCEL WATCH: Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 158
Original Issue Time: 2017 May 16 2126 UTC

Comment: The G2 (Moderate) Geomagnetic Storm Watch for 17 May 2017 has been canceled. A new Watch product will be issued shortly to update conditions expected 18-20 May 2017

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.

Tuesday, 16 May 2017

21:26 UTC

Space Weather Message Code: WATA30
Serial Number: 158
Issue Time: 2017 May 16 2126 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 17:  G2 (Moderate)   May 18:  G2 (Moderate)   May 19:  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.

Monday, 15 May 2017

22:08 UTC

Space Weather Message Code: WARK04
Serial Number: 3217
Issue Time: 2017 May 15 2208 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3216
Valid From: 2017 May 15 0957 UTC
Now Valid Until: 2017 May 16 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.

21:06 UTC

Space Weather Message Code: WATA30
Serial Number: 157
Issue Time: 2017 May 15 2106 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 16:  G1 (Minor)   May 17:  G2 (Moderate)   May 18:  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.

11:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 1976
Issue Time: 2017 May 15 1152 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 15 1150 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.

09:58 UTC

Space Weather Message Code: WARK04
Serial Number: 3216
Issue Time: 2017 May 15 0958 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 15 0957 UTC
Valid To: 2017 May 15 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.

Sunday, 14 May 2017

20:27 UTC

Space Weather Message Code: WATA30
Serial Number: 156
Issue Time: 2017 May 14 2027 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
May 15:  None (Below G1)   May 16:  G1 (Minor)   May 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.

Saturday, 13 May 2017

19:29 UTC

Space Weather Message Code: WATA20
Serial Number: 785
Issue Time: 2017 May 13 1929 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
May 14:  None (Below G1)   May 15:  None (Below G1)   May 16:  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, 7 May 2017

16:30 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2600
Issue Time: 2017 May 07 1630 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 May 07 1615 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.

Thursday, 4 May 2017

22:22 UTC

Space Weather Message Code: ALTK04
Serial Number: 1975
Issue Time: 2017 May 04 2222 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 04 2222 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.

21:35 UTC

Space Weather Message Code: WARK04
Serial Number: 3215
Issue Time: 2017 May 04 2135 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 04 2135 UTC
Valid To: 2017 May 05 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.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2599
Issue Time: 2017 May 04 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2598
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 7832 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, 3 May 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2598
Issue Time: 2017 May 03 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2597
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8389 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, 2 May 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2597
Issue Time: 2017 May 02 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2596
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5370 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, 1 May 2017

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2596
Issue Time: 2017 May 01 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2595
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8939 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, 30 April 2017

07:40 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2595
Issue Time: 2017 Apr 30 0740 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2594
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 15914 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.

Saturday, 29 April 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2594
Issue Time: 2017 Apr 29 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2593
Begin Time: 2017 Apr 21 1425 UTC
Yesterday Maximum 2MeV Flux: 56297 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.
Current data suggest that it is not possible to see aurora now at middle latitudes
The strength of the interplanetary magnetic field is moderate (10.3nT), the direction is North (5.97nT).

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 20% 15%
Middle latitude 5% 1%
Predicted Kp max 4
Solar activity
M-class solar flare 5%
X-class solar flare 1%
Moon phase
Waxing Crescent

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Last X-flare:2015/05/05X2.7
Last M-flare:2017/04/03M5.8
Last geomagnetic storm:2017/05/28Kp7 (G3)
Number of spotless days in 2017:37
Last spotless day:2017/05/15

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