NOAA SWPC Alerts, Watches and Warnings

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

Saturday, 17 August 2019

13:50 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2972
Issue Time: 2019 Aug 17 1350 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2971
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 2115 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, 16 August 2019

10:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2971
Issue Time: 2019 Aug 16 1006 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2970
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 5259 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, 15 August 2019

09:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2970
Issue Time: 2019 Aug 15 0900 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2969
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 4811 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, 14 August 2019

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2969
Issue Time: 2019 Aug 14 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2968
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 5359 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, 13 August 2019

11:18 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2968
Issue Time: 2019 Aug 13 1118 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2967
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 5184 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, 12 August 2019

11:35 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2967
Issue Time: 2019 Aug 12 1135 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2966
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 5494 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, 11 August 2019

09:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2966
Issue Time: 2019 Aug 11 0900 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2965
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 12622 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, 10 August 2019

09:08 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2965
Issue Time: 2019 Aug 10 0908 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2964
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 16351 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, 9 August 2019

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2964
Issue Time: 2019 Aug 09 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2963
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 20276 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, 8 August 2019

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2963
Issue Time: 2019 Aug 08 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2962
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 26161 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, 7 August 2019

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2962
Issue Time: 2019 Aug 07 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2961
Begin Time: 2019 Aug 06 1015 UTC
Yesterday Maximum 2MeV Flux: 25891 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, 6 August 2019

11:50 UTC

Space Weather Message Code: WARK04
Serial Number: 3651
Issue Time: 2019 Aug 06 1150 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3650
Valid From: 2019 Aug 05 0336 UTC
Now Valid Until: 2019 Aug 06 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.

10:30 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2961
Issue Time: 2019 Aug 06 1030 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2019 Aug 06 1015 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.

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3650
Issue Time: 2019 Aug 06 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3649
Valid From: 2019 Aug 05 0336 UTC
Now Valid Until: 2019 Aug 06 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.

Monday, 5 August 2019

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3649
Issue Time: 2019 Aug 05 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3648
Valid From: 2019 Aug 05 0336 UTC
Now Valid Until: 2019 Aug 06 0600 UTC
Warning Condition: Persistence

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

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

16:22 UTC

Space Weather Message Code: ALTK05
Serial Number: 1271
Issue Time: 2019 Aug 05 1622 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Aug 05 1622 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.

14:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1527
Issue Time: 2019 Aug 05 1443 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1526
Valid From: 2019 Aug 05 0705 UTC
Now Valid Until: 2019 Aug 05 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.

12:46 UTC

Space Weather Message Code: ALTK05
Serial Number: 1270
Issue Time: 2019 Aug 05 1246 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Aug 05 1246 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

10:53 UTC

Space Weather Message Code: WARK06
Serial Number: 431
Issue Time: 2019 Aug 05 1053 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2019 Aug 05 1053 UTC
Valid To: 2019 Aug 05 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

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

10:32 UTC

Space Weather Message Code: ALTK05
Serial Number: 1269
Issue Time: 2019 Aug 05 1032 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Aug 05 1031 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.

08:13 UTC

Space Weather Message Code: ALTK05
Serial Number: 1268
Issue Time: 2019 Aug 05 0813 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2019 Aug 05 0813 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.

07:32 UTC

Space Weather Message Code: ALTK04
Serial Number: 2119
Issue Time: 2019 Aug 05 0732 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2019 Aug 05 0731 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.

07:07 UTC

Space Weather Message Code: WARK05
Serial Number: 1526
Issue Time: 2019 Aug 05 0707 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2019 Aug 05 0705 UTC
Valid To: 2019 Aug 05 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.

03:36 UTC

Space Weather Message Code: WARK04
Serial Number: 3648
Issue Time: 2019 Aug 05 0336 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Aug 05 0336 UTC
Valid To: 2019 Aug 05 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.

Saturday, 3 August 2019

12:53 UTC

Space Weather Message Code: WATA20
Serial Number: 861
Issue Time: 2019 Aug 03 1253 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 04: None (Below G1) Aug 05: G1 (Minor) Aug 06: 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.

Friday, 2 August 2019

13:39 UTC

Space Weather Message Code: WATA20
Serial Number: 860
Issue Time: 2019 Aug 02 1339 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 03: None (Below G1) Aug 04: None (Below G1) Aug 05: 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.

Tuesday, 30 July 2019

23:31 UTC

Space Weather Message Code: WARK04
Serial Number: 3647
Issue Time: 2019 Jul 30 2331 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3646
Valid From: 2019 Jul 30 1605 UTC
Now Valid Until: 2019 Jul 31 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.

16:06 UTC

Space Weather Message Code: WARK04
Serial Number: 3646
Issue Time: 2019 Jul 30 1606 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Jul 30 1605 UTC
Valid To: 2019 Jul 30 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.

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