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, 17 October 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2685
Issue Time: 2017 Oct 17 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2684
Begin Time: 2017 Oct 12 1350 UTC
Yesterday Maximum 2MeV Flux: 36945 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, 16 October 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2684
Issue Time: 2017 Oct 16 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2683
Begin Time: 2017 Oct 12 1350 UTC
Yesterday Maximum 2MeV Flux: 59298 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, 15 October 2017

15:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1187
Issue Time: 2017 Oct 15 1501 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 15 1459 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.

14:11 UTC

Space Weather Message Code: WARK05
Serial Number: 1426
Issue Time: 2017 Oct 15 1411 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Oct 15 1410 UTC
Valid To: 2017 Oct 15 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.

14:11 UTC

Space Weather Message Code: WARK04
Serial Number: 3347
Issue Time: 2017 Oct 15 1411 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3346
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 16 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.

05:25 UTC

Space Weather Message Code: WARK04
Serial Number: 3346
Issue Time: 2017 Oct 15 0525 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3345
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 15 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.

05:13 UTC

Space Weather Message Code: WARK06
Serial Number: 410
Issue Time: 2017 Oct 15 0513 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Oct 15 0513 UTC
Valid To: 2017 Oct 15 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.

05:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2683
Issue Time: 2017 Oct 15 0506 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2682
Begin Time: 2017 Oct 12 1350 UTC
Yesterday Maximum 2MeV Flux: 32632 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.

04:39 UTC

Space Weather Message Code: ALTK05
Serial Number: 1186
Issue Time: 2017 Oct 15 0439 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 15 0439 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.

04:31 UTC

Space Weather Message Code: WARK05
Serial Number: 1425
Issue Time: 2017 Oct 15 0431 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Oct 15 0430 UTC
Valid To: 2017 Oct 15 0900 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, 14 October 2017

14:32 UTC

Space Weather Message Code: WARK04
Serial Number: 3345
Issue Time: 2017 Oct 14 1432 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3344
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 15 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.

14:32 UTC

Space Weather Message Code: WARK05
Serial Number: 1424
Issue Time: 2017 Oct 14 1432 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1423
Valid From: 2017 Oct 13 0420 UTC
Now Valid Until: 2017 Oct 14 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.

10:12 UTC

Space Weather Message Code: ALTK05
Serial Number: 1185
Issue Time: 2017 Oct 14 1012 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 14 1008 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.

09:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1184
Issue Time: 2017 Oct 14 0901 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 14 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.

05:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2682
Issue Time: 2017 Oct 14 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2681
Begin Time: 2017 Oct 12 1350 UTC
Yesterday Maximum 2MeV Flux: 4987 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: WARK06
Serial Number: 409
Issue Time: 2017 Oct 14 0255 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 408
Valid From: 2017 Oct 13 1446 UTC
Now Valid Until: 2017 Oct 14 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.

02:55 UTC

Space Weather Message Code: WARK05
Serial Number: 1423
Issue Time: 2017 Oct 14 0255 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1422
Valid From: 2017 Oct 13 0420 UTC
Now Valid Until: 2017 Oct 14 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.

01:31 UTC

Space Weather Message Code: ALTK05
Serial Number: 1183
Issue Time: 2017 Oct 14 0131 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 14 0130 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.

Friday, 13 October 2017

22:58 UTC

Space Weather Message Code: ALTK05
Serial Number: 1182
Issue Time: 2017 Oct 13 2258 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 13 2257 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.

19:44 UTC

Space Weather Message Code: WARK05
Serial Number: 1422
Issue Time: 2017 Oct 13 1944 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1421
Valid From: 2017 Oct 13 0420 UTC
Now Valid Until: 2017 Oct 14 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.

19:44 UTC

Space Weather Message Code: WARK04
Serial Number: 3344
Issue Time: 2017 Oct 13 1944 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3343
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 14 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.

19:44 UTC

Space Weather Message Code: ALTK06
Serial Number: 454
Issue Time: 2017 Oct 13 1944 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Oct 13 1944 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.

19:44 UTC

Space Weather Message Code: WARK06
Serial Number: 408
Issue Time: 2017 Oct 13 1944 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 407
Valid From: 2017 Oct 13 1446 UTC
Now Valid Until: 2017 Oct 14 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.

19:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1181
Issue Time: 2017 Oct 13 1902 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 13 1902 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.

17:22 UTC

Space Weather Message Code: WATA20
Serial Number: 802
Issue Time: 2017 Oct 13 1722 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 14:  G1 (Minor)   Oct 15:  None (Below G1)   Oct 16:  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.

15:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1180
Issue Time: 2017 Oct 13 1559 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 13 1559 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.

15:13 UTC

Space Weather Message Code: WARK04
Serial Number: 3343
Issue Time: 2017 Oct 13 1513 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3342
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 14 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.

15:00 UTC

Space Weather Message Code: ALTK06
Serial Number: 453
Issue Time: 2017 Oct 13 1500 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Oct 13 1459 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.

14:46 UTC

Space Weather Message Code: WARK06
Serial Number: 407
Issue Time: 2017 Oct 13 1446 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Oct 13 1446 UTC
Valid To: 2017 Oct 13 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.

14:41 UTC

Space Weather Message Code: ALTK05
Serial Number: 1179
Issue Time: 2017 Oct 13 1441 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 13 1441 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.

14:37 UTC

Space Weather Message Code: WARK04
Serial Number: 3342
Issue Time: 2017 Oct 13 1437 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3341
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 13 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.

14:37 UTC

Space Weather Message Code: WARK05
Serial Number: 1421
Issue Time: 2017 Oct 13 1437 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1420
Valid From: 2017 Oct 13 0420 UTC
Now Valid Until: 2017 Oct 13 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.

11:09 UTC

Space Weather Message Code: WARK05
Serial Number: 1420
Issue Time: 2017 Oct 13 1109 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1419
Valid From: 2017 Oct 13 0420 UTC
Now Valid Until: 2017 Oct 13 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.

11:08 UTC

Space Weather Message Code: WARK04
Serial Number: 3341
Issue Time: 2017 Oct 13 1108 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3340
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 13 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.

08:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2681
Issue Time: 2017 Oct 13 0831 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2680
Begin Time: 2017 Oct 12 1350 UTC
Yesterday Maximum 2MeV Flux: 2808 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.

06:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1178
Issue Time: 2017 Oct 13 0601 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 13 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.

04:22 UTC

Space Weather Message Code: WARK05
Serial Number: 1419
Issue Time: 2017 Oct 13 0422 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Oct 13 0420 UTC
Valid To: 2017 Oct 13 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.

Thursday, 12 October 2017

18:17 UTC

Space Weather Message Code: WARK04
Serial Number: 3340
Issue Time: 2017 Oct 12 1817 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3339
Valid From: 2017 Oct 11 0150 UTC
Now Valid Until: 2017 Oct 13 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.

17:54 UTC

Space Weather Message Code: WARK05
Serial Number: 1418
Issue Time: 2017 Oct 12 1754 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1417
Valid From: 2017 Oct 11 0730 UTC
Now Valid Until: 2017 Oct 13 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.

15:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1177
Issue Time: 2017 Oct 12 1500 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 12 1459 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.

14:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2680
Issue Time: 2017 Oct 12 1405 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Oct 12 1350 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.

10:44 UTC

Space Weather Message Code: WARK05
Serial Number: 1417
Issue Time: 2017 Oct 12 1044 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1416
Valid From: 2017 Oct 11 0730 UTC
Now Valid Until: 2017 Oct 12 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.

00:41 UTC

Space Weather Message Code: ALTK05
Serial Number: 1176
Issue Time: 2017 Oct 12 0041 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 12 0040 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.

Wednesday, 11 October 2017

23:57 UTC

Space Weather Message Code: WARK05
Serial Number: 1416
Issue Time: 2017 Oct 11 2357 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1415
Valid From: 2017 Oct 11 0730 UTC
Now Valid Until: 2017 Oct 12 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.

17:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 1175
Issue Time: 2017 Oct 11 1751 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 11 1748 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.

14:19 UTC

Space Weather Message Code: WARK05
Serial Number: 1415
Issue Time: 2017 Oct 11 1419 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1414
Valid From: 2017 Oct 11 0730 UTC
Now Valid Until: 2017 Oct 11 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.

08:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 1174
Issue Time: 2017 Oct 11 0851 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 11 0851 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.

07:28 UTC

Space Weather Message Code: WARK05
Serial Number: 1414
Issue Time: 2017 Oct 11 0728 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Oct 11 0730 UTC
Valid To: 2017 Oct 11 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.

05:53 UTC

Space Weather Message Code: ALTK04
Serial Number: 2009
Issue Time: 2017 Oct 11 0553 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Oct 11 0551 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.

01:51 UTC

Space Weather Message Code: WARK04
Serial Number: 3339
Issue Time: 2017 Oct 11 0151 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Oct 11 0150 UTC
Valid To: 2017 Oct 12 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.

Tuesday, 10 October 2017

19:47 UTC

Space Weather Message Code: WATA20
Serial Number: 801
Issue Time: 2017 Oct 10 1947 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 11:  G1 (Minor)   Oct 12:  G1 (Minor)   Oct 13:  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, 9 October 2017

19:18 UTC

Space Weather Message Code: WATA20
Serial Number: 800
Issue Time: 2017 Oct 09 1918 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 10:  None (Below G1)   Oct 11:  G1 (Minor)   Oct 12:  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, 8 October 2017

17:53 UTC

Space Weather Message Code: WATA20
Serial Number: 799
Issue Time: 2017 Oct 08 1753 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 09:  None (Below G1)   Oct 10:  None (Below G1)   Oct 11:  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.

Thursday, 5 October 2017

13:36 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2679
Issue Time: 2017 Oct 05 1336 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2678
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 8352 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, 4 October 2017

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2678
Issue Time: 2017 Oct 04 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2677
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 6557 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, 3 October 2017

06:26 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2677
Issue Time: 2017 Oct 03 0626 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2676
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 28078 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, 2 October 2017

06:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 2008
Issue Time: 2017 Oct 02 0600 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Oct 02 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.

05:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3338
Issue Time: 2017 Oct 02 0545 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Oct 02 0545 UTC
Valid To: 2017 Oct 02 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.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2676
Issue Time: 2017 Oct 02 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2675
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 14652 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, 1 October 2017

07:36 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2675
Issue Time: 2017 Oct 01 0736 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2674
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 52054 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: 3337
Issue Time: 2017 Oct 01 0255 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3336
Valid From: 2017 Sep 30 0520 UTC
Now Valid Until: 2017 Oct 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.

Saturday, 30 September 2017

20:30 UTC

Space Weather Message Code: WARK04
Serial Number: 3336
Issue Time: 2017 Sep 30 2030 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3335
Valid From: 2017 Sep 30 0520 UTC
Now Valid Until: 2017 Oct 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 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: 3335
Issue Time: 2017 Sep 30 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3334
Valid From: 2017 Sep 30 0520 UTC
Now Valid Until: 2017 Sep 30 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.

09:03 UTC

Space Weather Message Code: ALTK04
Serial Number: 2007
Issue Time: 2017 Sep 30 0903 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 30 0859 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.

05:21 UTC

Space Weather Message Code: WARK04
Serial Number: 3334
Issue Time: 2017 Sep 30 0521 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 30 0520 UTC
Valid To: 2017 Sep 30 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.

05:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2674
Issue Time: 2017 Sep 30 0503 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2673
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 38412 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, 29 September 2017

11:51 UTC

Space Weather Message Code: WARK04
Serial Number: 3333
Issue Time: 2017 Sep 29 1151 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3332
Valid From: 2017 Sep 27 0610 UTC
Now Valid Until: 2017 Sep 29 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.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2673
Issue Time: 2017 Sep 29 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2672
Begin Time: 2017 Sep 28 1235 UTC
Yesterday Maximum 2MeV Flux: 5465 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, 28 September 2017

23:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1173
Issue Time: 2017 Sep 28 2330 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 28 2330 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.

20:48 UTC

Space Weather Message Code: WARK05
Serial Number: 1413
Issue Time: 2017 Sep 28 2048 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1412
Valid From: 2017 Sep 27 0749 UTC
Now Valid Until: 2017 Sep 29 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.

14:36 UTC

Space Weather Message Code: WARK04
Serial Number: 3332
Issue Time: 2017 Sep 28 1436 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3331
Valid From: 2017 Sep 27 0610 UTC
Now Valid Until: 2017 Sep 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.

14:31 UTC

Space Weather Message Code: WARK05
Serial Number: 1412
Issue Time: 2017 Sep 28 1431 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1411
Valid From: 2017 Sep 27 0749 UTC
Now Valid Until: 2017 Sep 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.

12:52 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2672
Issue Time: 2017 Sep 28 1252 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Sep 28 1235 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.

10:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1172
Issue Time: 2017 Sep 28 1007 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 28 1007 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.

08:22 UTC

Space Weather Message Code: WARK06
Serial Number: 406
Issue Time: 2017 Sep 28 0822 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 405
Valid From: 2017 Sep 27 2012 UTC
Now Valid Until: 2017 Sep 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 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.

08:05 UTC

Space Weather Message Code: ALTK07
Serial Number: 111
Issue Time: 2017 Sep 28 0805 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2017 Sep 28 0805 UTC
Synoptic Period: 0600-0900 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.

07:49 UTC

Space Weather Message Code: ALTK06
Serial Number: 452
Issue Time: 2017 Sep 28 0749 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 28 0749 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.

06:36 UTC

Space Weather Message Code: ALTK05
Serial Number: 1171
Issue Time: 2017 Sep 28 0636 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 28 0635 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.

06:00 UTC

Space Weather Message Code: ALTK07
Serial Number: 110
Issue Time: 2017 Sep 28 0600 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2017 Sep 28 0559 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.

05:37 UTC

Space Weather Message Code: WARK07
Serial Number: 73
Issue Time: 2017 Sep 28 0537 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2017 Sep 28 0536 UTC
Valid To: 2017 Sep 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.

05:09 UTC

Space Weather Message Code: ALTK06
Serial Number: 451
Issue Time: 2017 Sep 28 0509 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 28 0508 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.

04:12 UTC

Space Weather Message Code: ALTK05
Serial Number: 1170
Issue Time: 2017 Sep 28 0412 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 28 0411 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.

03:03 UTC

Space Weather Message Code: ALTK06
Serial Number: 450
Issue Time: 2017 Sep 28 0303 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 28 0259 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.

02:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3331
Issue Time: 2017 Sep 28 0245 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3330
Valid From: 2017 Sep 27 0610 UTC
Now Valid Until: 2017 Sep 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 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.

02:45 UTC

Space Weather Message Code: WARK06
Serial Number: 405
Issue Time: 2017 Sep 28 0245 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 404
Valid From: 2017 Sep 27 2012 UTC
Now Valid Until: 2017 Sep 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 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.

02:45 UTC

Space Weather Message Code: WARK05
Serial Number: 1411
Issue Time: 2017 Sep 28 0245 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1410
Valid From: 2017 Sep 27 0749 UTC
Now Valid Until: 2017 Sep 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.

01:32 UTC

Space Weather Message Code: ALTK05
Serial Number: 1169
Issue Time: 2017 Sep 28 0132 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 28 0130 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.

Wednesday, 27 September 2017

22:22 UTC

Space Weather Message Code: ALTK06
Serial Number: 449
Issue Time: 2017 Sep 27 2222 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 27 2220 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.

22:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1168
Issue Time: 2017 Sep 27 2203 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 27 2202 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.

20:24 UTC

Space Weather Message Code: ALTK06
Serial Number: 448
Issue Time: 2017 Sep 27 2024 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 27 2024 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.

20:13 UTC

Space Weather Message Code: WARK06
Serial Number: 404
Issue Time: 2017 Sep 27 2013 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Sep 27 2012 UTC
Valid To: 2017 Sep 28 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.

20:11 UTC

Space Weather Message Code: ALTK05
Serial Number: 1167
Issue Time: 2017 Sep 27 2011 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 27 2010 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.

19:47 UTC

Space Weather Message Code: WATA30
Serial Number: 170
Issue Time: 2017 Sep 27 1947 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

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

17:05 UTC

Space Weather Message Code: WARK04
Serial Number: 3330
Issue Time: 2017 Sep 27 1705 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3329
Valid From: 2017 Sep 27 0610 UTC
Now Valid Until: 2017 Sep 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.

17:05 UTC

Space Weather Message Code: WARK05
Serial Number: 1410
Issue Time: 2017 Sep 27 1705 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1409
Valid From: 2017 Sep 27 0749 UTC
Now Valid Until: 2017 Sep 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.

08:48 UTC

Space Weather Message Code: ALTK05
Serial Number: 1166
Issue Time: 2017 Sep 27 0848 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 27 0848 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.

07:49 UTC

Space Weather Message Code: WARK05
Serial Number: 1409
Issue Time: 2017 Sep 27 0749 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 27 0749 UTC
Valid To: 2017 Sep 27 1800 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.

07:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3329
Issue Time: 2017 Sep 27 0745 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3328
Valid From: 2017 Sep 27 0610 UTC
Now Valid Until: 2017 Sep 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.

07:44 UTC

Space Weather Message Code: ALTK04
Serial Number: 2006
Issue Time: 2017 Sep 27 0744 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 27 0745 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.

06:11 UTC

Space Weather Message Code: WARK04
Serial Number: 3328
Issue Time: 2017 Sep 27 0611 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 27 0610 UTC
Valid To: 2017 Sep 27 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, 25 September 2017

20:46 UTC

Space Weather Message Code: WATA30
Serial Number: 169
Issue Time: 2017 Sep 25 2046 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 26:  None (Below G1)   Sep 27:  G1 (Minor)   Sep 28:  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.

Sunday, 24 September 2017

23:04 UTC

Space Weather Message Code: WARK04
Serial Number: 3327
Issue Time: 2017 Sep 24 2304 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 24 2303 UTC
Valid To: 2017 Sep 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.

21:10 UTC

Space Weather Message Code: WATA20
Serial Number: 798
Issue Time: 2017 Sep 24 2110 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Sep 25:  None (Below G1)   Sep 26:  None (Below G1)   Sep 27:  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.

11:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2671
Issue Time: 2017 Sep 24 1105 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2670
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 2143 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, 23 September 2017

12:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2670
Issue Time: 2017 Sep 23 1206 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2669
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 36942 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, 22 September 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2669
Issue Time: 2017 Sep 22 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2668
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 30386 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, 21 September 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2668
Issue Time: 2017 Sep 21 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2667
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 33761 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, 20 September 2017

05:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2667
Issue Time: 2017 Sep 20 0505 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2666
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 34880 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.

03:53 UTC

Space Weather Message Code: WARK04
Serial Number: 3326
Issue Time: 2017 Sep 20 0353 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 20 0352 UTC
Valid To: 2017 Sep 20 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, 19 September 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2666
Issue Time: 2017 Sep 19 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2665
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 31067 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, 18 September 2017

23:11 UTC

Space Weather Message Code: WARK04
Serial Number: 3325
Issue Time: 2017 Sep 18 2311 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3324
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 19 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.

08:56 UTC

Space Weather Message Code: ALTK05
Serial Number: 1165
Issue Time: 2017 Sep 18 0856 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 18 0856 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.

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3324
Issue Time: 2017 Sep 18 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3323
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 18 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.

08:55 UTC

Space Weather Message Code: WARK05
Serial Number: 1408
Issue Time: 2017 Sep 18 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1407
Valid From: 2017 Sep 18 0235 UTC
Now Valid Until: 2017 Sep 18 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.

06:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2665
Issue Time: 2017 Sep 18 0616 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2664
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 46263 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.

02:38 UTC

Space Weather Message Code: WARK05
Serial Number: 1407
Issue Time: 2017 Sep 18 0238 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 18 0235 UTC
Valid To: 2017 Sep 18 0900 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.

02:38 UTC

Space Weather Message Code: WARK04
Serial Number: 3323
Issue Time: 2017 Sep 18 0238 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3322
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 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.

Sunday, 17 September 2017

23:43 UTC

Space Weather Message Code: WARK04
Serial Number: 3322
Issue Time: 2017 Sep 17 2343 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3321
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 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.
Current data suggest that it is not possible to see aurora now at middle latitudes

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 25% 30%
Middle latitude 5% 1%
Predicted Kp max 3
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
Waning Crescent

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Last X-flare:2017/09/10X8.2
Last M-flare:2017/09/09M1.1
Last geomagnetic storm:2017/10/15Kp5 (G1)
Number of spotless days in 2017:64
Current stretch spotless days:2

This day in history*

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*since 1994