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.

Monday, 11 December 2017

14:31 UTC

Space Weather Message Code: WARK04
Serial Number: 3391
Issue Time: 2017 Dec 11 1431 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3390
Valid From: 2017 Dec 11 0825 UTC
Now Valid Until: 2017 Dec 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 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.

08:25 UTC

Space Weather Message Code: WARK04
Serial Number: 3390
Issue Time: 2017 Dec 11 0825 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 11 0825 UTC
Valid To: 2017 Dec 11 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.

Sunday, 10 December 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2717
Issue Time: 2017 Dec 10 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2716
Begin Time: 2017 Dec 06 1340 UTC
Yesterday Maximum 2MeV Flux: 4185 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, 9 December 2017

07:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2716
Issue Time: 2017 Dec 09 0751 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2715
Begin Time: 2017 Dec 06 1340 UTC
Yesterday Maximum 2MeV Flux: 3376 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, 8 December 2017

08:56 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2715
Issue Time: 2017 Dec 08 0856 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2714
Begin Time: 2017 Dec 06 1340 UTC
Yesterday Maximum 2MeV Flux: 3753 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, 7 December 2017

08:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2714
Issue Time: 2017 Dec 07 0831 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2713
Begin Time: 2017 Dec 06 1340 UTC
Yesterday Maximum 2MeV Flux: 3260 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, 6 December 2017

19:17 UTC

Space Weather Message Code: WARK04
Serial Number: 3389
Issue Time: 2017 Dec 06 1917 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 06 1920 UTC
Valid To: 2017 Dec 06 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.

13:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2713
Issue Time: 2017 Dec 06 1359 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Dec 06 1340 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.

Tuesday, 5 December 2017

14:17 UTC

Space Weather Message Code: WARK06
Serial Number: 413
Issue Time: 2017 Dec 05 1417 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Dec 05 1420 UTC
Valid To: 2017 Dec 05 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.

14:17 UTC

Space Weather Message Code: WARK04
Serial Number: 3388
Issue Time: 2017 Dec 05 1417 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3387
Valid From: 2017 Dec 04 1620 UTC
Now Valid Until: 2017 Dec 06 0900 UTC
Warning Condition: Persistence

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

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

14:17 UTC

Space Weather Message Code: WARK05
Serial Number: 1444
Issue Time: 2017 Dec 05 1417 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1443
Valid From: 2017 Dec 05 0818 UTC
Now Valid Until: 2017 Dec 06 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.

14:08 UTC

Space Weather Message Code: ALTK05
Serial Number: 1202
Issue Time: 2017 Dec 05 1408 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Dec 05 1407 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.

10:17 UTC

Space Weather Message Code: ALTK05
Serial Number: 1201
Issue Time: 2017 Dec 05 1017 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Dec 05 1017 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.

08:18 UTC

Space Weather Message Code: WARK05
Serial Number: 1443
Issue Time: 2017 Dec 05 0818 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Dec 05 0818 UTC
Valid To: 2017 Dec 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.

05:50 UTC

Space Weather Message Code: WARK04
Serial Number: 3387
Issue Time: 2017 Dec 05 0550 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3386
Valid From: 2017 Dec 04 1620 UTC
Now Valid Until: 2017 Dec 05 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.

Monday, 4 December 2017

18:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2022
Issue Time: 2017 Dec 04 1801 UTC

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

16:20 UTC

Space Weather Message Code: WARK04
Serial Number: 3386
Issue Time: 2017 Dec 04 1620 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 04 1620 UTC
Valid To: 2017 Dec 05 0600 UTC
Warning Condition: Onset

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

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

05:21 UTC

Space Weather Message Code: WARK04
Serial Number: 3385
Issue Time: 2017 Dec 04 0521 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 04 0520 UTC
Valid To: 2017 Dec 04 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.

Sunday, 3 December 2017

21:58 UTC

Space Weather Message Code: WATA30
Serial Number: 174
Issue Time: 2017 Dec 03 2158 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Dec 04:  G2 (Moderate)   Dec 05:  G2 (Moderate)   Dec 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 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Saturday, 2 December 2017

16:21 UTC

Space Weather Message Code: WATA30
Serial Number: 173
Issue Time: 2017 Dec 02 1621 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Dec 03:  None (Below G1)   Dec 04:  G2 (Moderate)   Dec 05:  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.

Friday, 1 December 2017

21:54 UTC

Space Weather Message Code: WATA20
Serial Number: 811
Issue Time: 2017 Dec 01 2154 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 02:  None (Below G1)   Dec 03:  None (Below G1)   Dec 04:  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, 30 November 2017

04:20 UTC

Space Weather Message Code: ALTK04
Serial Number: 2021
Issue Time: 2017 Nov 30 0420 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 30 0420 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.

03:44 UTC

Space Weather Message Code: WARK04
Serial Number: 3384
Issue Time: 2017 Nov 30 0344 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 30 0343 UTC
Valid To: 2017 Nov 30 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, 28 November 2017

03:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 2020
Issue Time: 2017 Nov 28 0300 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 28 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.

02:16 UTC

Space Weather Message Code: WARK04
Serial Number: 3383
Issue Time: 2017 Nov 28 0216 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 28 0215 UTC
Valid To: 2017 Nov 28 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.

Sunday, 26 November 2017

22:00 UTC

Space Weather Message Code: WATA20
Serial Number: 810
Issue Time: 2017 Nov 26 2200 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 27:  None (Below G1)   Nov 28:  None (Below G1)   Nov 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 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, 25 November 2017

03:05 UTC

Space Weather Message Code: ALTK04
Serial Number: 2019
Issue Time: 2017 Nov 25 0305 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 25 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.

01:27 UTC

Space Weather Message Code: WARK04
Serial Number: 3382
Issue Time: 2017 Nov 25 0127 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 25 0127 UTC
Valid To: 2017 Nov 25 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.

Friday, 24 November 2017

11:20 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2712
Issue Time: 2017 Nov 24 1120 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2711
Begin Time: 2017 Nov 22 1020 UTC
Yesterday Maximum 2MeV Flux: 4658 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, 23 November 2017

09:35 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2711
Issue Time: 2017 Nov 23 0935 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2710
Begin Time: 2017 Nov 22 1020 UTC
Yesterday Maximum 2MeV Flux: 2743 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, 22 November 2017

10:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2710
Issue Time: 2017 Nov 22 1037 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Nov 22 1020 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.

Tuesday, 21 November 2017

22:43 UTC

Space Weather Message Code: WARK04
Serial Number: 3381
Issue Time: 2017 Nov 21 2243 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3380
Valid From: 2017 Nov 20 2320 UTC
Now Valid Until: 2017 Nov 22 0600 UTC
Warning Condition: Persistence

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

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

22:42 UTC

Space Weather Message Code: WARK05
Serial Number: 1442
Issue Time: 2017 Nov 21 2242 UTC

CANCEL WARNING: Geomagnetic K-index of 5 expected
Cancel Serial Number: 1441
Original Issue Time: 2017 Nov 21 0434 UTC

Comment: G1 Warrning extension issued by mistake.  

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

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

22:40 UTC

Space Weather Message Code: WARK05
Serial Number: 1441
Issue Time: 2017 Nov 21 2240 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1440
Valid From: 2017 Nov 21 0432 UTC
Now Valid Until: 2017 Nov 22 0600 UTC
Warning Condition: Persistence

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

Potential Impacts: Area of impact primarily poleward of 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.

11:48 UTC

Space Weather Message Code: WARK05
Serial Number: 1440
Issue Time: 2017 Nov 21 1148 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1439
Valid From: 2017 Nov 21 0432 UTC
Now Valid Until: 2017 Nov 21 1800 UTC
Warning Condition: Persistence

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

Potential Impacts: Area of impact primarily poleward of 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.

11:48 UTC

Space Weather Message Code: WARK04
Serial Number: 3380
Issue Time: 2017 Nov 21 1148 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3379
Valid From: 2017 Nov 20 2320 UTC
Now Valid Until: 2017 Nov 21 2359 UTC
Warning Condition: Persistence

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

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

08:25 UTC

Space Weather Message Code: ALTK05
Serial Number: 1200
Issue Time: 2017 Nov 21 0825 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 21 0825 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.

05:31 UTC

Space Weather Message Code: ALTK05
Serial Number: 1199
Issue Time: 2017 Nov 21 0531 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 21 0530 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.

04:34 UTC

Space Weather Message Code: WARK05
Serial Number: 1439
Issue Time: 2017 Nov 21 0434 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Nov 21 0432 UTC
Valid To: 2017 Nov 21 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.

04:34 UTC

Space Weather Message Code: WARK04
Serial Number: 3379
Issue Time: 2017 Nov 21 0434 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3378
Valid From: 2017 Nov 20 2320 UTC
Now Valid Until: 2017 Nov 21 1500 UTC
Warning Condition: Persistence

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

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

Monday, 20 November 2017

23:40 UTC

Space Weather Message Code: ALTK04
Serial Number: 2018
Issue Time: 2017 Nov 20 2340 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 20 2340 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes

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

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

23:18 UTC

Space Weather Message Code: WARK04
Serial Number: 3378
Issue Time: 2017 Nov 20 2318 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 20 2320 UTC
Valid To: 2017 Nov 21 0600 UTC
Warning Condition: Onset

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

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

14:13 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2709
Issue Time: 2017 Nov 20 1413 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2708
Begin Time: 2017 Nov 17 1150 UTC
Yesterday Maximum 2MeV Flux: 1481 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.

13:30 UTC

Space Weather Message Code: WARK04
Serial Number: 3377
Issue Time: 2017 Nov 20 1330 UTC

CANCEL WARNING: Geomagnetic K-index of 4 expected
Cancel Serial Number: 3376
Original Issue Time: 2017 Nov 20 1301 UTC

Comment: Conditions no longer a potential for near storm activity

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.

13:01 UTC

Space Weather Message Code: WARK04
Serial Number: 3376
Issue Time: 2017 Nov 20 1301 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 20 1300 UTC
Valid To: 2017 Nov 20 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.

Sunday, 19 November 2017

13:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2708
Issue Time: 2017 Nov 19 1316 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2707
Begin Time: 2017 Nov 17 1150 UTC
Yesterday Maximum 2MeV Flux: 2356 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, 18 November 2017

11:36 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2707
Issue Time: 2017 Nov 18 1136 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2706
Begin Time: 2017 Nov 17 1150 UTC
Yesterday Maximum 2MeV Flux: 2332 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, 17 November 2017

12:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2706
Issue Time: 2017 Nov 17 1207 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Nov 17 1150 UTC
Station: GOES-13
 

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

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

Thursday, 16 November 2017

05:01 UTC

Space Weather Message Code: WARK05
Serial Number: 1438
Issue Time: 2017 Nov 16 0501 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Nov 16 0500 UTC
Valid To: 2017 Nov 16 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.

02:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3375
Issue Time: 2017 Nov 16 0255 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3374
Valid From: 2017 Nov 15 1610 UTC
Now Valid Until: 2017 Nov 16 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.

Wednesday, 15 November 2017

20:50 UTC

Space Weather Message Code: WARK04
Serial Number: 3374
Issue Time: 2017 Nov 15 2050 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3373
Valid From: 2017 Nov 15 1610 UTC
Now Valid Until: 2017 Nov 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.

18:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 2017
Issue Time: 2017 Nov 15 1800 UTC

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

16:10 UTC

Space Weather Message Code: WARK04
Serial Number: 3373
Issue Time: 2017 Nov 15 1610 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 15 1610 UTC
Valid To: 2017 Nov 15 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.

12:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2016
Issue Time: 2017 Nov 15 1201 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 15 1159 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.

11:11 UTC

Space Weather Message Code: WARK04
Serial Number: 3372
Issue Time: 2017 Nov 15 1111 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 15 1110 UTC
Valid To: 2017 Nov 15 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.

09:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2705
Issue Time: 2017 Nov 15 0905 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2704
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 12790 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, 14 November 2017

16:02 UTC

Space Weather Message Code: WARK04
Serial Number: 3371
Issue Time: 2017 Nov 14 1602 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 14 1603 UTC
Valid To: 2017 Nov 14 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.

06:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2704
Issue Time: 2017 Nov 14 0606 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2703
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 20582 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, 13 November 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2703
Issue Time: 2017 Nov 13 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2702
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 23581 pfu

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

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Current data suggest that it is not possible to see aurora now at middle latitudes
The solar wind speed is currently moderately high (512.6 km/sec.)

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 30% 35%
Middle latitude 10% 1%
Predicted Kp max 4
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
Last Quarter

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Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2017/12/05Kp5 (G1)
Number of spotless days in 2017:94
Last spotless day:2017/12/09

This day in history*

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12001M5.6
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32001M3.0
42000M1.3
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*since 1994