Space Weather Alerts, Watches and Warnings
Issue Time: 2018 Jan 20 0529 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jan 20 0530 UTC
Valid To: 2018 Jan 20 1500 UTC
Warning Condition: Onset
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.

Issue Time: 2018 Jan 15 0855 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3404
Valid From: 2018 Jan 15 0105 UTC
Now Valid Until: 2018 Jan 15 1500 UTC
Warning Condition: Persistence
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.

Issue Time: 2018 Jan 15 0245 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jan 15 0245 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
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.

Issue Time: 2018 Jan 15 0103 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jan 15 0105 UTC
Valid To: 2018 Jan 15 0900 UTC
Warning Condition: Onset
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.

Issue Time: 2018 Jan 14 0300 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Jan 14 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2018 Jan 14 0206 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Jan 14 0210 UTC
Valid To: 2018 Jan 14 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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.

Issue Time: 2018 Jan 14 0116 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jan 14 0115 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
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.

Issue Time: 2018 Jan 13 1815 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jan 13 1815 UTC
Valid To: 2018 Jan 14 1200 UTC
Warning Condition: Onset
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.

Issue Time: 2018 Jan 09 0302 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jan 09 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
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.

Issue Time: 2018 Jan 09 0153 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jan 09 0153 UTC
Valid To: 2018 Jan 09 1500 UTC
Warning Condition: Onset
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.

Issue Time: 2018 Jan 08 1440 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jan 08 1431 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
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.

Issue Time: 2018 Jan 08 1319 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jan 08 1318 UTC
Valid To: 2018 Jan 08 1918 UTC
Warning Condition: Onset
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.

Issue Time: 2018 Jan 01 0501 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3399
Valid From: 2017 Dec 31 2010 UTC
Now Valid Until: 2018 Jan 01 2100 UTC
Warning Condition: Persistence
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.

Issue Time: 2018 Jan 01 0411 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jan 01 0410 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
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.

Issue Time: 2017 Dec 31 2011 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 31 2010 UTC
Valid To: 2018 Jan 01 0600 UTC
Warning Condition: Onset
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.

Issue Time: 2017 Dec 29 1854 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 30: None (Below G1) Dec 31: None (Below G1) Jan 01: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2017 Dec 29 1803 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Dec 29 1745 UTC
Station: GOES-15

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

Issue Time: 2017 Dec 27 1600 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Dec 27 1545 UTC
Station: GOES15

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

Issue Time: 2017 Dec 26 2324 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3397
Valid From: 2017 Dec 26 1958 UTC
Now Valid Until: 2017 Dec 27 0600 UTC
Warning Condition: Persistence
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.

Issue Time: 2017 Dec 26 2005 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2017 Dec 26 2005 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
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.

Issue Time: 2017 Dec 26 1958 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 26 1958 UTC
Valid To: 2017 Dec 26 2359 UTC
Warning Condition: Onset
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.

Issue Time: 2017 Dec 24 1341 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2017 Dec 24 1340 UTC
Valid To: 2017 Dec 25 0600 UTC
Warning Condition: Onset
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.

Issue Time: 2017 Dec 23 1903 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2723
Begin Time: 2017 Dec 17 2100 UTC
Yesterday Maximum 2MeV Flux: 3001 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2017 Dec 22 1155 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2722
Begin Time: 2017 Dec 17 2100 UTC
Yesterday Maximum 2MeV Flux: 2949 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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