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, 24 April 2018

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2772
Issue Time: 2018 Apr 24 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2771
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 17462 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, 23 April 2018

09:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2771
Issue Time: 2018 Apr 23 0901 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2770
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 22704 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, 22 April 2018

09:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2770
Issue Time: 2018 Apr 22 0900 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2769
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 24056 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, 21 April 2018

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3467
Issue Time: 2018 Apr 21 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3466
Valid From: 2018 Apr 20 0032 UTC
Now Valid Until: 2018 Apr 21 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 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.

13:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2769
Issue Time: 2018 Apr 21 1306 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2768
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 2622 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.

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3466
Issue Time: 2018 Apr 21 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3465
Valid From: 2018 Apr 20 0032 UTC
Now Valid Until: 2018 Apr 21 1500 UTC
Warning Condition: Persistence

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

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

Friday, 20 April 2018

20:26 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2768
Issue Time: 2018 Apr 20 2026 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2767
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 1199 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.

19:39 UTC

Space Weather Message Code: ALTK05
Serial Number: 1216
Issue Time: 2018 Apr 20 1939 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Apr 20 1938 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.

17:29 UTC

Space Weather Message Code: WARK04
Serial Number: 3465
Issue Time: 2018 Apr 20 1729 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3464
Valid From: 2018 Apr 20 0032 UTC
Now Valid Until: 2018 Apr 21 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.

17:27 UTC

Space Weather Message Code: WARK05
Serial Number: 1470
Issue Time: 2018 Apr 20 1727 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1469
Valid From: 2018 Apr 20 0510 UTC
Now Valid Until: 2018 Apr 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 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.

15:36 UTC

Space Weather Message Code: WATA20
Serial Number: 825
Issue Time: 2018 Apr 20 1536 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 21: G1 (Minor) Apr 22: None (Below G1) Apr 23: 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.

10:45 UTC

Space Weather Message Code: WARK04
Serial Number: 3464
Issue Time: 2018 Apr 20 1045 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3463
Valid From: 2018 Apr 20 0032 UTC
Now Valid Until: 2018 Apr 20 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.

10:45 UTC

Space Weather Message Code: WARK05
Serial Number: 1469
Issue Time: 2018 Apr 20 1045 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1468
Valid From: 2018 Apr 20 0510 UTC
Now Valid Until: 2018 Apr 20 1800 UTC
Warning Condition: Persistence

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

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

10:45 UTC

Space Weather Message Code: ALTK06
Serial Number: 461
Issue Time: 2018 Apr 20 1045 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2018 Apr 20 1044 UTC
Synoptic Period: 0900-1200 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.

09:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 1215
Issue Time: 2018 Apr 20 0953 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Apr 20 0953 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.

08:26 UTC

Space Weather Message Code: ALTK06
Serial Number: 460
Issue Time: 2018 Apr 20 0825 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2018 Apr 20 0825 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.

07:14 UTC

Space Weather Message Code: WARK06
Serial Number: 416
Issue Time: 2018 Apr 20 0714 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2018 Apr 20 0714 UTC
Valid To: 2018 Apr 20 1200 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.

06:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 1214
Issue Time: 2018 Apr 20 0651 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Apr 20 0650 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

05:58 UTC

Space Weather Message Code: ALTK05
Serial Number: 1213
Issue Time: 2018 Apr 20 0558 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Apr 20 0558 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.

05:12 UTC

Space Weather Message Code: WARK04
Serial Number: 3463
Issue Time: 2018 Apr 20 0512 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3462
Valid From: 2018 Apr 20 0032 UTC
Now Valid Until: 2018 Apr 20 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.

05:11 UTC

Space Weather Message Code: WARK05
Serial Number: 1468
Issue Time: 2018 Apr 20 0511 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Apr 20 0510 UTC
Valid To: 2018 Apr 20 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.

03:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 2050
Issue Time: 2018 Apr 20 0300 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Apr 20 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

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

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

00:33 UTC

Space Weather Message Code: WARK04
Serial Number: 3462
Issue Time: 2018 Apr 20 0033 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Apr 20 0032 UTC
Valid To: 2018 Apr 20 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.

Thursday, 19 April 2018

18:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2767
Issue Time: 2018 Apr 19 1816 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2766
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 3739 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, 18 April 2018

14:30 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2766
Issue Time: 2018 Apr 18 1430 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2765
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 4586 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, 17 April 2018

13:23 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2765
Issue Time: 2018 Apr 17 1323 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2764
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 4590 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, 16 April 2018

11:41 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2764
Issue Time: 2018 Apr 16 1141 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2763
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 6482 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, 15 April 2018

12:46 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2763
Issue Time: 2018 Apr 15 1246 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2762
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 8730 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, 14 April 2018

09:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2762
Issue Time: 2018 Apr 14 0901 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2761
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 21456 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, 13 April 2018

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2761
Issue Time: 2018 Apr 13 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2760
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 25452 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.

00:40 UTC

Space Weather Message Code: ALTK04
Serial Number: 2049
Issue Time: 2018 Apr 13 0040 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Apr 13 0040 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.

00:23 UTC

Space Weather Message Code: WARK04
Serial Number: 3461
Issue Time: 2018 Apr 13 0023 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Apr 13 0025 UTC
Valid To: 2018 Apr 13 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.

Thursday, 12 April 2018

09:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2760
Issue Time: 2018 Apr 12 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2759
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 11644 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.

07:42 UTC

Space Weather Message Code: WARK04
Serial Number: 3460
Issue Time: 2018 Apr 12 0742 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Apr 12 0741 UTC
Valid To: 2018 Apr 12 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.

Wednesday, 11 April 2018

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2759
Issue Time: 2018 Apr 11 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2758
Begin Time: 2018 Apr 10 1830 UTC
Yesterday Maximum 2MeV Flux: 2761 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.

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 3459
Issue Time: 2018 Apr 11 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3458
Valid From: 2018 Apr 09 2130 UTC
Now Valid Until: 2018 Apr 11 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.

03:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1212
Issue Time: 2018 Apr 11 0302 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Apr 11 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.

01:35 UTC

Space Weather Message Code: WARK05
Serial Number: 1467
Issue Time: 2018 Apr 11 0135 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Apr 11 0135 UTC
Valid To: 2018 Apr 11 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.

Tuesday, 10 April 2018

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 3458
Issue Time: 2018 Apr 10 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3457
Valid From: 2018 Apr 09 2130 UTC
Now Valid Until: 2018 Apr 11 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.

18:32 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2758
Issue Time: 2018 Apr 10 1832 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Apr 10 1830 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.

13:53 UTC

Space Weather Message Code: WARK04
Serial Number: 3457
Issue Time: 2018 Apr 10 1353 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3456
Valid From: 2018 Apr 09 2130 UTC
Now Valid Until: 2018 Apr 10 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.

07:02 UTC

Space Weather Message Code: WARK05
Serial Number: 1466
Issue Time: 2018 Apr 10 0702 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Apr 10 0702 UTC
Valid To: 2018 Apr 10 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.

05:52 UTC

Space Weather Message Code: WARK04
Serial Number: 3456
Issue Time: 2018 Apr 10 0552 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3455
Valid From: 2018 Apr 09 2130 UTC
Now Valid Until: 2018 Apr 10 1500 UTC
Warning Condition: Persistence

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

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

Monday, 9 April 2018

23:35 UTC

Space Weather Message Code: WARK05
Serial Number: 1465
Issue Time: 2018 Apr 09 2335 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Apr 09 2335 UTC
Valid To: 2018 Apr 10 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.

21:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 2048
Issue Time: 2018 Apr 09 2152 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Apr 09 2151 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.

21:31 UTC

Space Weather Message Code: WARK04
Serial Number: 3455
Issue Time: 2018 Apr 09 2131 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Apr 09 2130 UTC
Valid To: 2018 Apr 10 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.

Sunday, 8 April 2018

16:34 UTC

Space Weather Message Code: WATA20
Serial Number: 824
Issue Time: 2018 Apr 08 1634 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 09: None (Below G1) Apr 10: G1 (Minor) Apr 11: 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.

05:04 UTC

Space Weather Message Code: WATA20
Serial Number: 823
Issue Time: 2018 Apr 08 0504 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 09: None (Below G1) Apr 10: G1 (Minor) Apr 11: 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.

Tuesday, 3 April 2018

14:57 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2757
Issue Time: 2018 Apr 03 1457 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2756
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 2152 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, 2 April 2018

12:26 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2756
Issue Time: 2018 Apr 02 1226 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2755
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 2532 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, 1 April 2018

14:10 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2755
Issue Time: 2018 Apr 01 1410 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2754
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 6573 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, 31 March 2018

13:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2754
Issue Time: 2018 Mar 31 1337 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2753
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 11531 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, 30 March 2018

09:35 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1067
Issue Time: 2018 Mar 30 0935 UTC

ALERT: Type II Radio Emission
Begin Time: 2018 Mar 30 0757 UTC
Estimated Velocity: 493 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.

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2753
Issue Time: 2018 Mar 30 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2752
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 35131 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, 29 March 2018

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2752
Issue Time: 2018 Mar 29 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2751
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 43688 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, 28 March 2018

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2751
Issue Time: 2018 Mar 28 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2750
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 42355 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, 27 March 2018

08:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2750
Issue Time: 2018 Mar 27 0859 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2749
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 16460 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.

03:04 UTC

Space Weather Message Code: WARK04
Serial Number: 3454
Issue Time: 2018 Mar 27 0304 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Mar 27 0305 UTC
Valid To: 2018 Mar 27 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, 26 March 2018

13:20 UTC

Space Weather Message Code: ALTEF3
Serial Number: 2749
Issue Time: 2018 Mar 26 1320 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2748
Begin Time: 2018 Mar 16 0105 UTC
Yesterday Maximum 2MeV Flux: 5329 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.

05:41 UTC

Space Weather Message Code: WARK04
Serial Number: 3453
Issue Time: 2018 Mar 26 0542 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3452
Valid From: 2018 Mar 25 2122 UTC
Now Valid Until: 2018 Mar 26 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

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