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515
WOXX10 KWNP 112321
SUMSUD

Space Weather Message Code: SUMSUD
Serial Number: 290
Issue Time: 2025 Nov 11 2316 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2025 Nov 11 2300 UTC
Deviation: 17 nT
Station: BOU

Comment: Deviation of 17 nT observed at the Boulder magnetometer at 11/2300 UTC. This is likely the result of the first of three expected CME arrivals anticipated over approximately the next 17 to 18 hours.
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