Space Weather Alerts, Watches and Warnings
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
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 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
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 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
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 Jul 06 0255 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3500
Valid From: 2018 Jul 05 1310 UTC
Now Valid Until: 2018 Jul 06 1200 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 Jul 05 1952 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3499
Valid From: 2018 Jul 05 1310 UTC
Now Valid Until: 2018 Jul 06 0300 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 Jul 05 1946 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Jul 05 1936 UTC
Synoptic Period: 1800-2100 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 Jul 05 1832 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Jul 05 1832 UTC
Valid To: 2018 Jul 05 2300 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 Jul 05 1831 UTC
CANCEL WARNING: Geomagnetic K-index of 5 expected
Cancel Serial Number: 1481
Original Issue Time: 2018 Jul 05 1828 UTC
Comment: Cancel Warning to edit valid to: date to 05 July - incorrectly sent with 15 July
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 Jul 05 1828 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Jul 05 1828 UTC
Valid To: 2018 Jul 15 2300 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 Jul 05 1800 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jul 05 1754 UTC
Synoptic Period: 1500-1800 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 Jul 05 1311 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jul 05 1310 UTC
Valid To: 2018 Jul 05 2100 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 Jul 04 1623 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2812
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 3924 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jul 03 0859 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2811
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 4454 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jul 02 0900 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2810
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 5241 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jul 01 0900 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2809
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 5197 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 30 0905 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2808
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 4596 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 29 0901 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2807
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 5571 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 28 0859 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2806
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 3940 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 27 1526 UTC
CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 832
Original Issue Time: 2018 Jun 25 2040 UTC
Comment: Conditions no longer valid
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 Jun 27 1326 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2805
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 2668 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 26 1932 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jun 26 1931 UTC
Valid To: 2018 Jun 27 0300 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 Jun 26 1821 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2804
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 2919 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 26 1109 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3496
Valid From: 2018 Jun 25 2216 UTC
Now Valid Until: 2018 Jun 26 1800 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 Jun 26 0555 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3495
Valid From: 2018 Jun 25 2216 UTC
Now Valid Until: 2018 Jun 26 1200 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 Jun 26 0239 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Jun 26 0239 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 Jun 25 2250 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2018 Jun 25 2250 UTC
Synoptic Period: 2100-2400 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 Jun 25 2227 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2018 Jun 25 2226 UTC
Valid To: 2018 Jun 26 0600 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 Jun 25 2218 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jun 25 2218 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 Jun 25 2217 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jun 25 2216 UTC
Valid To: 2018 Jun 26 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 Jun 25 2040 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 26: None (Below G1) Jun 27: G1 (Minor) Jun 28: 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 Jun 25 1455 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2803
Begin Time: 2018 Jun 24 1800 UTC
Yesterday Maximum 2MeV Flux: 1133 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 24 2030 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 25: None (Below G1) Jun 26: None (Below G1) Jun 27: 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 Jun 24 1844 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Jun 24 1800 UTC
Station: GOES-15
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2018 Jun 23 2308 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jun 23 2208 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 Jun 23 2234 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jun 23 2233 UTC
Valid To: 2018 Jun 24 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 Jun 23 1040 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2018 Jun 23 1040 UTC
Synoptic Period: 0900-1200 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 Jun 23 1024 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2018 Jun 23 1024 UTC
Valid To: 2018 Jun 23 1800 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.
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