Space weather / EVENT RECORD

EXTENDED WARNING: Geomagnetic K-index of 4 expected

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

Bulletin issued

2026-10-04 19:01:38.570Z

Source update / publication

2026-10-04 19:01:38.570Z

EXTENDED WARNING: Geomagnetic K-index of 4 expected · Extension to Serial Number: 5424 · Valid From: 2026 Oct 04 0615 UTC · Now Valid Until: 2026 Oct 05 0300 UTC · Warning Condition: Persistence · extended past Kp5 warning. · NOAA Space Weather Scale descriptions can be found at

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:2026-10-04T19:01:38.570Z