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, 22 October 2019

21:12 UTC

Space Weather Message Code: WATA20
Serial Number: 865
Issue Time: 2019 Oct 22 2112 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 23: None (Below G1) Oct 24: G1 (Minor) Oct 25: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

Potential Impacts: Area of impact primarily poleward of 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, 21 October 2019

21:07 UTC

Space Weather Message Code: WATA20
Serial Number: 864
Issue Time: 2019 Oct 21 2107 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 22: None (Below G1) Oct 23: None (Below G1) Oct 24: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

Potential Impacts: Area of impact primarily poleward of 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, 10 October 2019

08:39 UTC

Space Weather Message Code: WARK04
Serial Number: 3680
Issue Time: 2019 Oct 10 0839 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3679
Valid From: 2019 Oct 10 0532 UTC
Now Valid Until: 2019 Oct 10 1200 UTC
Warning Condition: Persistence

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

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

05:47 UTC

Space Weather Message Code: ALTK04
Serial Number: 2133
Issue Time: 2019 Oct 10 0547 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Oct 10 0547 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.

05:32 UTC

Space Weather Message Code: WARK04
Serial Number: 3679
Issue Time: 2019 Oct 10 0532 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Oct 10 0532 UTC
Valid To: 2019 Oct 10 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, 9 October 2019

12:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2132
Issue Time: 2019 Oct 09 1202 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Oct 09 1200 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes

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

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

10:13 UTC

Space Weather Message Code: WARK04
Serial Number: 3678
Issue Time: 2019 Oct 09 1013 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Oct 09 1013 UTC
Valid To: 2019 Oct 09 1500 UTC
Warning Condition: Onset

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

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

Monday, 7 October 2019

12:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2998
Issue Time: 2019 Oct 07 1231 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2997
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 1690 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, 6 October 2019

13:22 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2997
Issue Time: 2019 Oct 06 1322 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2996
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 3342 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, 5 October 2019

13:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2996
Issue Time: 2019 Oct 05 1303 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2995
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 5994 pfu

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

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

13:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2996
Issue Time: 2019 Oct 05 1302 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2995
Begin Time:
Yesterday Maximum 2MeV Flux: 5994 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, 4 October 2019

16:29 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2995
Issue Time: 2019 Oct 04 1629 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2994
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 6014 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, 3 October 2019

08:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2994
Issue Time: 2019 Oct 03 0807 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2993
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 3930 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, 2 October 2019

12:49 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2993
Issue Time: 2019 Oct 02 1249 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2992
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 2055 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, 1 October 2019

12:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2992
Issue Time: 2019 Oct 01 1231 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2991
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 9178 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.

08:00 UTC

Space Weather Message Code: WARK04
Serial Number: 3677
Issue Time: 2019 Oct 01 0800 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3676
Valid From: 2019 Oct 01 0257 UTC
Now Valid Until: 2019 Oct 01 1500 UTC
Warning Condition: Persistence

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

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

03:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2131
Issue Time: 2019 Oct 01 0301 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Oct 01 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

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

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

02:58 UTC

Space Weather Message Code: WARK04
Serial Number: 3676
Issue Time: 2019 Oct 01 0258 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Oct 01 0257 UTC
Valid To: 2019 Oct 01 0900 UTC
Warning Condition: Onset

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

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

Monday, 30 September 2019

07:24 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2991
Issue Time: 2019 Sep 30 0724 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2990
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 49285 pfu

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

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

05:39 UTC

Space Weather Message Code: WARK04
Serial Number: 3675
Issue Time: 2019 Sep 30 0539 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Sep 30 0538 UTC
Valid To: 2019 Sep 30 1800 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.

00:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2129
Issue Time: 2019 Sep 30 0002 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Sep 29 2359 UTC
Synoptic Period: 2100-2359 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.

Sunday, 29 September 2019

19:52 UTC

Space Weather Message Code: WARK04
Serial Number: 3674
Issue Time: 2019 Sep 29 1952 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Sep 29 1951 UTC
Valid To: 2019 Sep 29 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.

10:10 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2990
Issue Time: 2019 Sep 29 1010 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2989
Begin Time: 2019 Sep 28 1310 UTC
Yesterday Maximum 2MeV Flux: 19967 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, 28 September 2019

19:51 UTC

Space Weather Message Code: WARK04
Serial Number: 3673
Issue Time: 2019 Sep 28 1951 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3672
Valid From: 2019 Sep 27 1000 UTC
Now Valid Until: 2019 Sep 29 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.

19:51 UTC

Space Weather Message Code: WARK05
Serial Number: 1538
Issue Time: 2019 Sep 28 1951 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1537
Valid From: 2019 Sep 27 1630 UTC
Now Valid Until: 2019 Sep 29 0600 UTC
Warning Condition: Persistence

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

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

13:30 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2989
Issue Time: 2019 Sep 28 1330 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2019 Sep 28 1310 UTC
Station: GOES14


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

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

12:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1288
Issue Time: 2019 Sep 28 1201 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Sep 28 1159 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

08:47 UTC

Space Weather Message Code: ALTK05
Serial Number: 1287
Issue Time: 2019 Sep 28 0847 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Sep 28 0845 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.

08:46 UTC

Space Weather Message Code: WARK05
Serial Number: 1537
Issue Time: 2019 Sep 28 0846 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1536
Valid From: 2019 Sep 27 1630 UTC
Now Valid Until: 2019 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.

04:45 UTC

Space Weather Message Code: ALTK05
Serial Number: 1286
Issue Time: 2019 Sep 28 0445 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Sep 27 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.

Friday, 27 September 2019

22:36 UTC

Space Weather Message Code: ALTK05
Serial Number: 1285
Issue Time: 2019 Sep 27 2236 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Sep 27 2235 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.

20:22 UTC

Space Weather Message Code: ALTK05
Serial Number: 1284
Issue Time: 2019 Sep 27 2022 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Sep 27 2021 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.

20:22 UTC

Space Weather Message Code: WARK06
Serial Number: 435
Issue Time: 2019 Sep 27 2022 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2019 Sep 27 2022 UTC
Valid To: 2019 Sep 28 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.

16:30 UTC

Space Weather Message Code: WARK05
Serial Number: 1536
Issue Time: 2019 Sep 27 1630 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2019 Sep 27 1630 UTC
Valid To: 2019 Sep 28 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.

16:30 UTC

Space Weather Message Code: ALTK04
Serial Number: 2128
Issue Time: 2019 Sep 27 1630 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Sep 27 1628 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

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

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

09:50 UTC

Space Weather Message Code: WARK04
Serial Number: 3672
Issue Time: 2019 Sep 27 0950 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Sep 27 1000 UTC
Valid To: 2019 Sep 28 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.

Thursday, 26 September 2019

17:11 UTC

Space Weather Message Code: WATA30
Serial Number: 183
Issue Time: 2019 Sep 26 1711 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 27: G1 (Minor) Sep 28: G2 (Moderate) Sep 29: 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.

17:01 UTC

Space Weather Message Code: WATA30
Serial Number: 182
Issue Time: 2019 Sep 26 1701 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 27: None (Below G1) Sep 28: G2 (Moderate) Sep 29: 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.

Wednesday, 25 September 2019

18:56 UTC

Space Weather Message Code: WATA30
Serial Number: 181
Issue Time: 2019 Sep 25 1856 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.

Tuesday, 24 September 2019

22:56 UTC

Space Weather Message Code: WARK04
Serial Number: 3671
Issue Time: 2019 Sep 24 2256 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3670
Valid From: 2019 Sep 24 1326 UTC
Now Valid Until: 2019 Sep 25 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.

20:48 UTC

Space Weather Message Code: WATA20
Serial Number: 863
Issue Time: 2019 Sep 24 2048 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.

18:05 UTC

Space Weather Message Code: ALTK04
Serial Number: 2127
Issue Time: 2019 Sep 24 1805 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Sep 24 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

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

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

13:28 UTC

Space Weather Message Code: WARK04
Serial Number: 3670
Issue Time: 2019 Sep 24 1328 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Sep 24 1326 UTC
Valid To: 2019 Sep 24 2300 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.

03:17 UTC

Space Weather Message Code: WARK04
Serial Number: 3669
Issue Time: 2019 Sep 24 0317 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Sep 24 0317 UTC
Valid To: 2019 Sep 24 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.

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2199637G3
3199932G1
4201026G1
5199519G1
*since 1994

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