Current conditions

:Product: Geophysical Alert Message wwv.txt
:Issued: 2026 Sep 21 2110 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
#
#          Geophysical Alert Message
#
Solar-terrestrial indices for 21 September follow.
Solar flux 104 and estimated planetary A-index 3.
The estimated planetary K-index at 2100 UTC on 21 September was 0.00.

No space weather storms were observed for the past 24 hours.

No space weather storms are predicted for the next 24 hours.

wwv alert messages

Last 25 or 250 wwv alert messages.

Solar activity and geomagnetic forecast

Geomagnetic 3 days forecast for high latitudes

planetary index (K)

UTC	00-03	03-06	06-09	09-12	12-15	15-18	18-21	21-00
2026 Sep 21	1	2	2	2	0	1	1	1
2026 Sep 22	1	2	2	2	0	0	1	1
2026 Sep 23	1	2	2	2	0	0	1	1

Probability of Geomagnetic conditions at high latitudes

	Active	Minor_Storm	Major-Severe_Storm
2026 Sep 21	15	20	15
2026 Sep 22	15	15	15
2026 Sep 23	15	15	15

Geomagnetic 3 days forecast for mid latitudes

planetary index (K)

UTC	00-03	03-06	06-09	09-12	12-15	15-18	18-21	21-00
2026 Sep 21	2	2	2	1	1	1	1	2
2026 Sep 22	2	2	2	1	1	1	2	2
2026 Sep 23	2	2	2	1	1	1	2	2

Probability of Geomagnetic conditions at mid latitudes

	Active	Minor_Storm	Major-Severe_Storm
2026 Sep 21	10	5	1
2026 Sep 22	10	5	1
2026 Sep 23	10	5	1

24-hour forecast of a polar cap absorption (PCA) event

Green
No active sunspot region on the Sun is likely to produce a PCA event in the 24 hours.

Computed daily at 23h00Utc from datas issued from SEC.
f5len.org (c 2004-2010)

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