Current conditions

:Product: Geophysical Alert Message wwv.txt
:Issued: 2026 Apr 16 1805 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
#
#          Geophysical Alert Message
#
Solar-terrestrial indices for 15 April follow.
Solar flux 105 and estimated planetary A-index 4.
The estimated planetary K-index at 1800 UTC on 16 April was 0.33.

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

Space weather for the next 24 hours is predicted to be moderate.
Geomagnetic storms reaching the G2 level are likely.

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 Apr 16	1	2	3	4	3	2	1	1
2026 Apr 17	2	2	3	3	2	3	4	4
2026 Apr 18	5	5	6	6	5	4	2	3

Probability of Geomagnetic conditions at high latitudes

	Active	Minor_Storm	Major-Severe_Storm
2026 Apr 16	15	25	25
2026 Apr 17	5	15	80
2026 Apr 18	5	15	85

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 Apr 16	2	3	3	2	2	1	2	2
2026 Apr 17	2	3	3	2	2	2	3	5
2026 Apr 18	5	5	4	3	3	3	2	4

Probability of Geomagnetic conditions at mid latitudes

	Active	Minor_Storm	Major-Severe_Storm
2026 Apr 16	20	5	1
2026 Apr 17	30	35	25
2026 Apr 18	30	40	25

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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