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.

Sunday, 12 August 2018

00:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 2065
Issue Time: 2018 Aug 12 0000 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Aug 11 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.

Saturday, 11 August 2018

14:36 UTC

Space Weather Message Code: WARK04
Serial Number: 3509
Issue Time: 2018 Aug 11 1436 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Aug 11 1436 UTC
Valid To: 2018 Aug 11 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.

Tuesday, 7 August 2018

14:21 UTC

Space Weather Message Code: WARK04
Serial Number: 3508
Issue Time: 2018 Aug 07 1421 UTC

CANCEL WARNING: Geomagnetic K-index of 4 expected
Cancel Serial Number: 3507
Original Issue Time: 2018 Aug 07 1341 UTC

Comment: Date error

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.

13:41 UTC

Space Weather Message Code: WARK04
Serial Number: 3507
Issue Time: 2018 Aug 07 1341 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Aug 10 1341 UTC
Valid To: 2018 Aug 10 1600 UTC
Warning Condition: Onset

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

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

Monday, 30 July 2018

16:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2819
Issue Time: 2018 Jul 30 1637 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2818
Begin Time: 2018 Jul 25 1355 UTC
Yesterday Maximum 2MeV Flux: 3181 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, 29 July 2018

15:08 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2818
Issue Time: 2018 Jul 29 1508 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2817
Begin Time: 2018 Jul 25 1355 UTC
Yesterday Maximum 2MeV Flux: 3095 pfu

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

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

Saturday, 28 July 2018

12:46 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2817
Issue Time: 2018 Jul 28 1246 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2816
Begin Time: 2018 Jul 25 1355 UTC
Yesterday Maximum 2MeV Flux: 3946 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, 27 July 2018

10:18 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2816
Issue Time: 2018 Jul 27 1018 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2815
Begin Time: 2018 Jul 25 1355 UTC
Yesterday Maximum 2MeV Flux: 2572 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, 26 July 2018

12:33 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2815
Issue Time: 2018 Jul 26 1233 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2814
Begin Time: 2018 Jul 25 1355 UTC
Yesterday Maximum 2MeV Flux: 3987 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, 25 July 2018

14:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2814
Issue Time: 2018 Jul 25 1402 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Jul 25 1355 UTC
Station: GOES15


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, 24 July 2018

22:07 UTC

Space Weather Message Code: ALTK04
Serial Number: 2064
Issue Time: 2018 Jul 24 2207 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jul 24 2207 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.

17:46 UTC

Space Weather Message Code: WARK04
Serial Number: 3506
Issue Time: 2018 Jul 24 1746 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3505
Valid From: 2018 Jul 24 0905 UTC
Now Valid Until: 2018 Jul 25 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.

09:05 UTC

Space Weather Message Code: WARK04
Serial Number: 3505
Issue Time: 2018 Jul 24 0905 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jul 24 0905 UTC
Valid To: 2018 Jul 24 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.

02:23 UTC

Space Weather Message Code: ALTK04
Serial Number: 2063
Issue Time: 2018 Jul 24 0223 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jul 24 0223 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.

01:42 UTC

Space Weather Message Code: WARK04
Serial Number: 3504
Issue Time: 2018 Jul 24 0142 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jul 24 0144 UTC
Valid To: 2018 Jul 24 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.

Saturday, 21 July 2018

18:31 UTC

Space Weather Message Code: WATA20
Serial Number: 834
Issue Time: 2018 Jul 21 1831 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

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

13:33 UTC

Space Weather Message Code: WARK04
Serial Number: 3503
Issue Time: 2018 Jul 21 1333 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jul 21 1334 UTC
Valid To: 2018 Jul 21 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.

Tuesday, 17 July 2018

05:52 UTC

Space Weather Message Code: WARK04
Serial Number: 3502
Issue Time: 2018 Jul 17 0552 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jul 17 0551 UTC
Valid To: 2018 Jul 17 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.

Current data suggest that it is not possible to see aurora now at middle latitudes

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