Space weather / EVENT RECORD

EXTENDED WARNING: Geomagnetic K-index of 4 expected

NOAA SWPC · Every measurement below belongs to the selected record.

Bulletin issued

2026-10-06 03:43:55.093Z

Source update / publication

2026-10-06 03:43:55.093Z

EXTENDED WARNING: Geomagnetic K-index of 4 expected · Extension to Serial Number: 5427 · Valid From: 2026 Oct 05 0155 UTC · Now Valid Until: 2026 Oct 06 1200 UTC · Warning Condition: Persistence · NOAA Space Weather Scale descriptions can be found at · www.swpc.noaa.gov/noaa-scales-explanation

This is a source-linked archive. Source measurements and assessments can change. An archived bulletin is not evidence that a warning is currently active.

In the daily journal

SOURCE ID swpc:K04W:2026-10-06T03:43:55.093Z