Space weather / EVENT RECORD
WARNING: Geomagnetic K-index of 4 expected
NOAA SWPC · Every measurement below belongs to the selected record.
Read the source-series history ↗- Bulletin issued
- 2026-10-21 16:17:18.167Z
- Source update / publication
- 2026-10-21 16:17:18.167Z
WARNING: Geomagnetic K-index of 4 expected · Valid From: 2026 Oct 21 1616 UTC · Valid To: 2026 Oct 22 0600 UTC · Warning Conditions: Onset · Comment: · NOAA Space Weather Scale descriptions can be found at · www.swpc.noaa.gov/noaa-scales-explanation
Read the original NOAA SWPC record ↗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
21 October 2026 ↗SOURCE ID swpc:K04W:2026-10-21T16:17:18.167Z