Space weather / EVENT RECORD

WARNING: Geomagnetic K-index of 4 expected

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

Bulletin issued

2026-10-04 06:13:42.580Z

Source update / publication

2026-10-04 06:13:42.580Z

WARNING: Geomagnetic K-index of 4 expected · Valid From: 2026 Oct 04 0615 UTC · Valid To: 2026 Oct 04 2359 UTC · Warning Conditions: Onset · Comment: · 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:2026-10-04T06:13:42.580Z