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.

Wednesday, 21 June 2017

06:52 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2611
Issue Time: 2017 Jun 21 0652 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2610
Begin Time: 2017 Jun 19 1125 UTC
Yesterday Maximum 2MeV Flux: 2737 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, 20 June 2017

08:36 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2610
Issue Time: 2017 Jun 20 0836 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2609
Begin Time: 2017 Jun 19 1125 UTC
Yesterday Maximum 2MeV Flux: 2735 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, 19 June 2017

11:40 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2609
Issue Time: 2017 Jun 19 1140 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Jun 19 1125 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.

Sunday, 18 June 2017

02:35 UTC

Space Weather Message Code: WARK04
Serial Number: 3237
Issue Time: 2017 Jun 18 0235 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3236
Valid From: 2017 Jun 17 2051 UTC
Now Valid Until: 2017 Jun 18 1400 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, 17 June 2017

20:55 UTC

Space Weather Message Code: ALTK04
Serial Number: 1985
Issue Time: 2017 Jun 17 2055 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 17 2055 UTC
Synoptic Period: 1800-2100 UTC
 
Active Warning: Yes

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

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

20:51 UTC

Space Weather Message Code: WARK04
Serial Number: 3236
Issue Time: 2017 Jun 17 2051 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 17 2051 UTC
Valid To: 2017 Jun 18 0300 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, 16 June 2017

23:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1118
Issue Time: 2017 Jun 16 2321 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jun 16 2320 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.

21:28 UTC

Space Weather Message Code: WARK04
Serial Number: 3235
Issue Time: 2017 Jun 16 2128 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3234
Valid From: 2017 Jun 16 0323 UTC
Now Valid Until: 2017 Jun 17 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.

21:17 UTC

Space Weather Message Code: WARK05
Serial Number: 1361
Issue Time: 2017 Jun 16 2117 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1360
Valid From: 2017 Jun 16 0843 UTC
Now Valid Until: 2017 Jun 17 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.

15:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1117
Issue Time: 2017 Jun 16 1500 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jun 16 1458 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.

14:56 UTC

Space Weather Message Code: WARK04
Serial Number: 3234
Issue Time: 2017 Jun 16 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3233
Valid From: 2017 Jun 16 0323 UTC
Now Valid Until: 2017 Jun 16 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.

14:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1360
Issue Time: 2017 Jun 16 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1359
Valid From: 2017 Jun 16 0843 UTC
Now Valid Until: 2017 Jun 16 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.

08:44 UTC

Space Weather Message Code: ALTK04
Serial Number: 1984
Issue Time: 2017 Jun 16 0844 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 16 0844 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.

08:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1359
Issue Time: 2017 Jun 16 0843 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jun 16 0843 UTC
Valid To: 2017 Jun 16 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.

03:24 UTC

Space Weather Message Code: WARK04
Serial Number: 3233
Issue Time: 2017 Jun 16 0324 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 16 0323 UTC
Valid To: 2017 Jun 16 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.

Thursday, 15 June 2017

19:34 UTC

Space Weather Message Code: WATA20
Serial Number: 788
Issue Time: 2017 Jun 15 1934 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 16:  G1 (Minor)   Jun 17:  None (Below G1)   Jun 18:  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.

Monday, 12 June 2017

05:44 UTC

Space Weather Message Code: WARK04
Serial Number: 3232
Issue Time: 2017 Jun 12 0544 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3231
Valid From: 2017 Jun 11 1434 UTC
Now Valid Until: 2017 Jun 12 1400 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, 11 June 2017

20:27 UTC

Space Weather Message Code: WARK04
Serial Number: 3231
Issue Time: 2017 Jun 11 2027 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3230
Valid From: 2017 Jun 11 1434 UTC
Now Valid Until: 2017 Jun 12 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.

18:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1116
Issue Time: 2017 Jun 11 1801 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Jun 11 1759 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.

17:35 UTC

Space Weather Message Code: WARK05
Serial Number: 1358
Issue Time: 2017 Jun 11 1735 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jun 11 1733 UTC
Valid To: 2017 Jun 11 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.

16:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 1983
Issue Time: 2017 Jun 11 1652 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 11 1650 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.

14:34 UTC

Space Weather Message Code: WARK04
Serial Number: 3230
Issue Time: 2017 Jun 11 1434 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 11 1434 UTC
Valid To: 2017 Jun 11 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, 4 June 2017

10:10 UTC

Space Weather Message Code: WATA20
Serial Number: 787
Issue Time: 2017 Jun 04 1010 UTC

CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 786
Original Issue Time: 2017 Jun 03 1844 UTC

Comment: A decrease in solar wind enhancement has deminished the potential for G1 (Minor) geomagnetic storms.

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, 3 June 2017

18:44 UTC

Space Weather Message Code: WATA20
Serial Number: 786
Issue Time: 2017 Jun 03 1844 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

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

16:46 UTC

Space Weather Message Code: ALTK04
Serial Number: 1982
Issue Time: 2017 Jun 03 1646 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 03 1645 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.

13:32 UTC

Space Weather Message Code: WARK05
Serial Number: 1357
Issue Time: 2017 Jun 03 1332 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Jun 03 1330 UTC
Valid To: 2017 Jun 03 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.

13:32 UTC

Space Weather Message Code: WARK04
Serial Number: 3229
Issue Time: 2017 Jun 03 1332 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3228
Valid From: 2017 Jun 03 1210 UTC
Now Valid Until: 2017 Jun 04 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.

12:08 UTC

Space Weather Message Code: WARK04
Serial Number: 3228
Issue Time: 2017 Jun 03 1208 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 03 1210 UTC
Valid To: 2017 Jun 03 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.

Thursday, 1 June 2017

02:15 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1053
Issue Time: 2017 Jun 01 0215 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Jun 01 0144 UTC
Estimated Velocity: 1459 km/s

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

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Tuesday, 30 May 2017

06:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 1981
Issue Time: 2017 May 30 0601 UTC

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

03:30 UTC

Space Weather Message Code: WARK04
Serial Number: 3227
Issue Time: 2017 May 30 0330 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 30 0330 UTC
Valid To: 2017 May 30 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, 29 May 2017

13:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 1980
Issue Time: 2017 May 29 1352 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 29 1348 UTC
Synoptic Period: 1200-1500 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.

13:21 UTC

Space Weather Message Code: WARK04
Serial Number: 3226
Issue Time: 2017 May 29 1321 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 May 29 1322 UTC
Valid To: 2017 May 29 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, 28 May 2017

14:43 UTC

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

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1355
Valid From: 2017 May 27 2204 UTC
Now Valid Until: 2017 May 28 2100 UTC
Warning Condition: Persistence

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

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

10:26 UTC

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

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 1020 UTC
Synoptic Period: 0900-1200 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

08:24 UTC

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

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0823 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

07:19 UTC

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

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0718 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

04:30 UTC

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

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

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

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

04:20 UTC

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

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

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

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

04:10 UTC

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

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1354
Valid From: 2017 May 27 2204 UTC
Now Valid Until: 2017 May 28 1500 UTC
Warning Condition: Persistence

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

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

04:10 UTC

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

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 386
Valid From: 2017 May 27 2320 UTC
Now Valid Until: 2017 May 28 0900 UTC
Warning Condition: Onset

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

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

04:10 UTC

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

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

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

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

03:50 UTC

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

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0349 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

03:30 UTC

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

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0329 UTC
Synoptic Period: 0300-0600 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

02:25 UTC

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

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 28 0224 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

01:06 UTC

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

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 28 0105 UTC
Synoptic Period: 0000-0300 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

Saturday, 27 May 2017

23:23 UTC

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

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2017 May 27 2322 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

23:20 UTC

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

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 May 27 2320 UTC
Valid To: 2017 May 28 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

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

22:55 UTC

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

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 May 27 2255 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

22:04 UTC

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

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 May 27 2204 UTC
Valid To: 2017 May 28 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

22:02 UTC

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

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 May 27 2202 UTC
Synoptic Period: 2100-2400 UTC
 
Active Warning: Yes

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

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

20:45 UTC

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

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3223
Valid From: 2017 May 27 1530 UTC
Now Valid Until: 2017 May 28 0900 UTC
Warning Condition: Persistence

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

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

15:46 UTC

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

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

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

15:23 UTC

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

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

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

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

15:05 UTC

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

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

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

05:01 UTC

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

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

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

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

Friday, 26 May 2017

05:00 UTC

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

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

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

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Current data suggest that it is not possible to see aurora now at middle latitudes

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Auroral activity Minor Severe
High latitude 25% 20%
Middle latitude 1% 1%
Predicted Kp max 2
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
New Moon

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Last spotless day:2017/06/12

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