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341
WOXX13 KWNP 191801
WARK04

Space Weather Message Code: WARK04
Serial Number: 5406
Issue Time: 2026 Aug 19 1757 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5405
Valid From: 2026 Aug 17 2101 UTC
Now Valid Until: 2026 Aug 20 0900 UTC
Warning Condition: Persistence
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.

# Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Recent messages, data, and help at http://swpc.noaa.gov/alerts/
# Send questions to SWPC.Webmaster@noaa.gov

973
WOXX11 KWNP 182046
WARK05

Space Weather Message Code: WARK05
Serial Number: 2260
Issue Time: 2026 Aug 18 2043 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Aug 18 2042 UTC
Valid To: 2026 Aug 19 1200 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor

Comment:
NOAA Scale: G1 - Minor
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.

# Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Recent messages, data, and help at http://swpc.noaa.gov/alerts/
# Send questions to SWPC.Webmaster@noaa.gov