Space Weather Alerts, Watches and Warnings
Issue Time: 2018 Dec 11 1300 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2879
Begin Time: 2018 Dec 10 2010 UTC
Yesterday Maximum 2MeV Flux: 1081 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Dec 10 2026 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Dec 10 2010 UTC
Station: GOES-15

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

Issue Time: 2018 Dec 09 2304 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Dec 09 2304 UTC
Synoptic Period: 2100-2400 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 Dec 09 2243 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Dec 09 2244 UTC
Valid To: 2018 Dec 10 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 Dec 07 1945 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Dec 07 1945 UTC
Valid To: 2018 Dec 08 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: 2018 Dec 03 1835 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

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

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: 2018 Dec 03 1507 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Dec 03 1510 UTC
Valid To: 2018 Dec 03 2200 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 Dec 02 2359 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Dec 02 2359 UTC
Synoptic Period: 2100-2400 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 Dec 02 2351 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Dec 02 2350 UTC
Valid To: 2018 Dec 02 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: 2018 Dec 01 1725 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Dec 01 1725 UTC
Valid To: 2018 Dec 02 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: 2018 Nov 29 1438 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 30: None (Below G1) Dec 01: G1 (Minor) Dec 02: 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: 2018 Nov 28 1818 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 29: None (Below G1) Nov 30: None (Below G1) Dec 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: 2018 Nov 20 0520 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Nov 20 0521 UTC
Valid To: 2018 Nov 20 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 Nov 16 1701 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2877
Begin Time: 2018 Nov 11 1625 UTC
Yesterday Maximum 2MeV Flux: 1448 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Nov 15 1614 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2876
Begin Time: 2018 Nov 11 1625 UTC
Yesterday Maximum 2MeV Flux: 1887 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Nov 14 1400 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2875
Begin Time: 2018 Nov 11 1625 UTC
Yesterday Maximum 2MeV Flux: 1804 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Nov 13 1631 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2874
Begin Time: 2018 Nov 11 1625 UTC
Yesterday Maximum 2MeV Flux: 1094 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Nov 12 1901 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2873
Begin Time: 2018 Nov 11 1625 UTC
Yesterday Maximum 2MeV Flux: 1341 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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