Space weather / EVENT RECORD
EXTENDED WARNING: Geomagnetic K-index of 4 expected
NOAA SWPC · Every measurement below belongs to the selected record.
Read the source-series history ↗- Bulletin issued
- 2026-10-22 14:24:34.303Z
- Source update / publication
- 2026-10-22 14:24:34.303Z
EXTENDED WARNING: Geomagnetic K-index of 4 expected · Extension to Serial Number: 5439 · Valid From: 2026 Oct 21 1616 UTC · Now Valid Until: 2026 Oct 22 1800 UTC · Warning Condition: Persistence · 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
22 October 2026 ↗SOURCE ID swpc:K04W:2026-10-22T14:24:34.303Z