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 August 2017

02:56 UTC

Space Weather Message Code: WARK06
Serial Number: 392
Issue Time: 2017 Aug 22 0256 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Aug 22 0255 UTC
Valid To: 2017 Aug 22 0800 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.

02:44 UTC

Space Weather Message Code: ALTK05
Serial Number: 1137
Issue Time: 2017 Aug 22 0244 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 22 0244 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.

01:52 UTC

Space Weather Message Code: WARK05
Serial Number: 1381
Issue Time: 2017 Aug 22 0152 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 22 0155 UTC
Valid To: 2017 Aug 22 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.

00:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 1996
Issue Time: 2017 Aug 22 0052 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Aug 22 0052 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.

Monday, 21 August 2017

22:26 UTC

Space Weather Message Code: WARK04
Serial Number: 3284
Issue Time: 2017 Aug 21 2226 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 21 2225 UTC
Valid To: 2017 Aug 22 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.

11:21 UTC

Space Weather Message Code: WARK04
Serial Number: 3283
Issue Time: 2017 Aug 21 1121 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3282
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 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 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.

05:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2642
Issue Time: 2017 Aug 21 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2641
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 23393 pfu

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

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

02:54 UTC

Space Weather Message Code: WARK04
Serial Number: 3282
Issue Time: 2017 Aug 21 0254 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3281
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 21 1200 UTC
Warning Condition: Persistence

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

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

Sunday, 20 August 2017

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3281
Issue Time: 2017 Aug 20 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3280
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 21 0300 UTC
Warning Condition: Persistence

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

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

05:49 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2641
Issue Time: 2017 Aug 20 0549 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2640
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 8119 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.

05:35 UTC

Space Weather Message Code: ALTK05
Serial Number: 1136
Issue Time: 2017 Aug 20 0535 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 20 0535 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.

02:08 UTC

Space Weather Message Code: WARK05
Serial Number: 1380
Issue Time: 2017 Aug 20 0208 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1379
Valid From: 2017 Aug 19 0117 UTC
Now Valid Until: 2017 Aug 20 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.

02:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1135
Issue Time: 2017 Aug 20 0203 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 20 0203 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, 19 August 2017

22:44 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1055
Issue Time: 2017 Aug 19 2244 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Aug 19 2148 UTC
Estimated Velocity: 928 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.

18:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1134
Issue Time: 2017 Aug 19 1800 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 19 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.

14:36 UTC

Space Weather Message Code: WARK04
Serial Number: 3280
Issue Time: 2017 Aug 19 1436 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3279
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 20 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.

14:36 UTC

Space Weather Message Code: WARK05
Serial Number: 1379
Issue Time: 2017 Aug 19 1436 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1378
Valid From: 2017 Aug 19 0117 UTC
Now Valid Until: 2017 Aug 20 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.

12:41 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2640
Issue Time: 2017 Aug 19 1241 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2639
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 1170 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.

08:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1133
Issue Time: 2017 Aug 19 0857 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 19 0857 UTC
Synoptic Period: 0600-0900 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

06:31 UTC

Space Weather Message Code: WARK05
Serial Number: 1378
Issue Time: 2017 Aug 19 0631 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1377
Valid From: 2017 Aug 19 0117 UTC
Now Valid Until: 2017 Aug 19 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.

03:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1132
Issue Time: 2017 Aug 19 0301 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 19 0259 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.

01:25 UTC

Space Weather Message Code: WARK04
Serial Number: 3279
Issue Time: 2017 Aug 19 0125 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3278
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 19 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.

01:17 UTC

Space Weather Message Code: WARK05
Serial Number: 1377
Issue Time: 2017 Aug 19 0117 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 19 0117 UTC
Valid To: 2017 Aug 19 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.

Friday, 18 August 2017

20:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1131
Issue Time: 2017 Aug 18 2000 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 18 1959 UTC
Synoptic Period: 1800-2100 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

19:36 UTC

Space Weather Message Code: WARK05
Serial Number: 1376
Issue Time: 2017 Aug 18 1936 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 18 1935 UTC
Valid To: 2017 Aug 18 2359 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.

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3278
Issue Time: 2017 Aug 18 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3277
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 19 0600 UTC
Warning Condition: Persistence

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

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

17:09 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2639
Issue Time: 2017 Aug 18 1709 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Aug 18 1650 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.

04:57 UTC

Space Weather Message Code: WARK04
Serial Number: 3277
Issue Time: 2017 Aug 18 0457 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3276
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 18 1800 UTC
Warning Condition: Persistence

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

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

02:12 UTC

Space Weather Message Code: WARK05
Serial Number: 1375
Issue Time: 2017 Aug 18 0212 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 18 0212 UTC
Valid To: 2017 Aug 18 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

Thursday, 17 August 2017

14:48 UTC

Space Weather Message Code: WARK05
Serial Number: 1374
Issue Time: 2017 Aug 17 1448 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1373
Valid From: 2017 Aug 17 0808 UTC
Now Valid Until: 2017 Aug 17 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.

14:47 UTC

Space Weather Message Code: WARK04
Serial Number: 3276
Issue Time: 2017 Aug 17 1447 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3275
Valid From: 2017 Aug 17 0752 UTC
Now Valid Until: 2017 Aug 18 0600 UTC
Warning Condition: Persistence

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

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

13:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1130
Issue Time: 2017 Aug 17 1359 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 17 1350 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.

11:51 UTC

Space Weather Message Code: WARK06
Serial Number: 391
Issue Time: 2017 Aug 17 1151 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2017 Aug 17 1150 UTC
Valid To: 2017 Aug 17 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.

11:46 UTC

Space Weather Message Code: ALTK05
Serial Number: 1129
Issue Time: 2017 Aug 17 1146 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 17 1146 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.

08:17 UTC

Space Weather Message Code: ALTK05
Serial Number: 1128
Issue Time: 2017 Aug 17 0817 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 17 0816 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.

08:09 UTC

Space Weather Message Code: WARK05
Serial Number: 1373
Issue Time: 2017 Aug 17 0809 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 17 0808 UTC
Valid To: 2017 Aug 17 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.

08:05 UTC

Space Weather Message Code: ALTK04
Serial Number: 1995
Issue Time: 2017 Aug 17 0805 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Aug 17 0805 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.

07:52 UTC

Space Weather Message Code: WARK04
Serial Number: 3275
Issue Time: 2017 Aug 17 0752 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 17 0752 UTC
Valid To: 2017 Aug 17 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.

Wednesday, 16 August 2017

15:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2638
Issue Time: 2017 Aug 16 1516 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2637
Begin Time: 2017 Aug 15 1245 UTC
Yesterday Maximum 2MeV Flux: 1335 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, 15 August 2017

20:37 UTC

Space Weather Message Code: WATA20
Serial Number: 794
Issue Time: 2017 Aug 15 2037 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

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

13:17 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2637
Issue Time: 2017 Aug 15 1317 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Aug 15 1245 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.

Monday, 14 August 2017

18:36 UTC

Space Weather Message Code: WATA20
Serial Number: 793
Issue Time: 2017 Aug 14 1836 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 15:  None (Below G1)   Aug 16:  None (Below G1)   Aug 17:  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, 12 August 2017

23:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3274
Issue Time: 2017 Aug 12 2355 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3273
Valid From: 2017 Aug 12 0135 UTC
Now Valid Until: 2017 Aug 13 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.

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3273
Issue Time: 2017 Aug 12 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3272
Valid From: 2017 Aug 12 0135 UTC
Now Valid Until: 2017 Aug 12 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.

01:35 UTC

Space Weather Message Code: WARK04
Serial Number: 3272
Issue Time: 2017 Aug 12 0135 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 12 0135 UTC
Valid To: 2017 Aug 12 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.

Friday, 11 August 2017

08:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2636
Issue Time: 2017 Aug 11 0851 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2635
Begin Time: 2017 Aug 05 1405 UTC
Yesterday Maximum 2MeV Flux: 6775 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, 10 August 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2635
Issue Time: 2017 Aug 10 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2634
Begin Time: 2017 Aug 05 1405 UTC
Yesterday Maximum 2MeV Flux: 6998 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, 9 August 2017

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2634
Issue Time: 2017 Aug 09 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2633
Begin Time: 2017 Aug 05 1405 UTC
Yesterday Maximum 2MeV Flux: 10426 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, 8 August 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2633
Issue Time: 2017 Aug 08 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2632
Begin Time: 2017 Aug 05 1405 UTC
Yesterday Maximum 2MeV Flux: 11301 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, 7 August 2017

05:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2632
Issue Time: 2017 Aug 07 0503 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2631
Begin Time: 2017 Aug 05 1405 UTC
Yesterday Maximum 2MeV Flux: 8650 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 August 2017

14:19 UTC

Space Weather Message Code: WARK04
Serial Number: 3271
Issue Time: 2017 Aug 06 1419 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3270
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 06 2359 UTC
Warning Condition: Persistence

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

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

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3270
Issue Time: 2017 Aug 06 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3269
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 06 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.

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2631
Issue Time: 2017 Aug 06 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2630
Begin Time: 2017 Aug 05 1405 UTC
Yesterday Maximum 2MeV Flux: 6434 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 August 2017

23:53 UTC

Space Weather Message Code: WARK04
Serial Number: 3269
Issue Time: 2017 Aug 05 2353 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3268
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 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.

14:27 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2630
Issue Time: 2017 Aug 05 1427 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Aug 05 1405 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.

05:50 UTC

Space Weather Message Code: WARK04
Serial Number: 3268
Issue Time: 2017 Aug 05 0550 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3267
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 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 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.

05:44 UTC

Space Weather Message Code: WARK05
Serial Number: 1372
Issue Time: 2017 Aug 05 0544 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1371
Valid From: 2017 Aug 04 0630 UTC
Now Valid Until: 2017 Aug 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 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, 4 August 2017

14:31 UTC

Space Weather Message Code: WARK04
Serial Number: 3267
Issue Time: 2017 Aug 04 1431 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3266
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 05 1200 UTC
Warning Condition: Persistence

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

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

14:31 UTC

Space Weather Message Code: WARK05
Serial Number: 1371
Issue Time: 2017 Aug 04 1431 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1370
Valid From: 2017 Aug 04 0630 UTC
Now Valid Until: 2017 Aug 05 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.

06:31 UTC

Space Weather Message Code: WARK05
Serial Number: 1370
Issue Time: 2017 Aug 04 0631 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 04 0630 UTC
Valid To: 2017 Aug 04 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.

06:31 UTC

Space Weather Message Code: WARK04
Serial Number: 3266
Issue Time: 2017 Aug 04 0631 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3265
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 04 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.

00:21 UTC

Space Weather Message Code: WARK04
Serial Number: 3265
Issue Time: 2017 Aug 04 0021 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3264
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 04 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.

Thursday, 3 August 2017

23:48 UTC

Space Weather Message Code: WARK04
Serial Number: 3264
Issue Time: 2017 Aug 03 2348 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3263
Valid From: 2017 Aug 03 1717 UTC
Now Valid Until: 2017 Aug 03 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.

18:06 UTC

Space Weather Message Code: ALTK04
Serial Number: 1994
Issue Time: 2017 Aug 03 1806 UTC

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

17:16 UTC

Space Weather Message Code: WARK04
Serial Number: 3263
Issue Time: 2017 Aug 03 1716 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 03 1717 UTC
Valid To: 2017 Aug 03 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.

15:10 UTC

Space Weather Message Code: WATA30
Serial Number: 162
Issue Time: 2017 Aug 03 1510 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Aug 04:  G2 (Moderate)   Aug 05:  G1 (Minor)   Aug 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 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.

13:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2629
Issue Time: 2017 Aug 03 1331 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2628
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 2755 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 August 2017

13:38 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2628
Issue Time: 2017 Aug 02 1338 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2627
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 4277 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 August 2017

10:53 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2627
Issue Time: 2017 Aug 01 1053 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2626
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 8563 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, 31 July 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2626
Issue Time: 2017 Jul 31 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2625
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 7053 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, 30 July 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2625
Issue Time: 2017 Jul 30 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2624
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 8288 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, 29 July 2017

07:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2624
Issue Time: 2017 Jul 29 0701 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2623
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 14317 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, 28 July 2017

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2623
Issue Time: 2017 Jul 28 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2622
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 16548 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, 27 July 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2622
Issue Time: 2017 Jul 27 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2621
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 13962 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, 26 July 2017

07:40 UTC

Space Weather Message Code: ALTK04
Serial Number: 1993
Issue Time: 2017 Jul 26 0740 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 26 0740 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.

07:29 UTC

Space Weather Message Code: WARK04
Serial Number: 3262
Issue Time: 2017 Jul 26 0729 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 26 0729 UTC
Valid To: 2017 Jul 26 1200 UTC
Warning Condition: Onset

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

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

05:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2621
Issue Time: 2017 Jul 26 0503 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2620
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 18833 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.

00:38 UTC

Space Weather Message Code: WARK04
Serial Number: 3261
Issue Time: 2017 Jul 26 0038 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 26 0037 UTC
Valid To: 2017 Jul 26 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.

Tuesday, 25 July 2017

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2620
Issue Time: 2017 Jul 25 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2619
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 14765 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.

00:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 1992
Issue Time: 2017 Jul 25 0001 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 24 2359 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.

Monday, 24 July 2017

23:00 UTC

Space Weather Message Code: WARK04
Serial Number: 3260
Issue Time: 2017 Jul 24 2300 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 24 2300 UTC
Valid To: 2017 Jul 25 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.

05:44 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2619
Issue Time: 2017 Jul 24 0544 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2618
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 5777 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, 23 July 2017

23:24 UTC

Space Weather Message Code: ALTK04
Serial Number: 1991
Issue Time: 2017 Jul 23 2324 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Jul 23 2323 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.

23:12 UTC

Space Weather Message Code: WARK04
Serial Number: 3259
Issue Time: 2017 Jul 23 2312 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Jul 23 2312 UTC
Valid To: 2017 Jul 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.

10:55 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2618
Issue Time: 2017 Jul 23 1055 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2617
Begin Time: 2017 Jul 17 0325 UTC
Yesterday Maximum 2MeV Flux: 3619 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.

05:51 UTC

Space Weather Message Code: WARK04
Serial Number: 3258
Issue Time: 2017 Jul 23 0551 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3257
Valid From: 2017 Jul 21 0212 UTC
Now Valid Until: 2017 Jul 23 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.
Current data suggest that it is not possible to see aurora now at middle latitudes
Active geomagnetic conditions expected
The solar wind speed is currently moderately high (574.6 km/sec.)

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 25% 35%
Middle latitude 5% 1%
Predicted Kp max 4
Solar activity
M-class solar flare 25%
X-class solar flare 1%
Moon phase
New Moon

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Last M-flare:2017/08/20M1.1
Last geomagnetic storm:2017/08/20Kp5 (G1)
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Last spotless day:2017/08/01

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