Message:21305 In: SPACWX.USA
From: N4SDDate: Thu, 23 Apr 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11791_N4SD>
Path: N2MH4|N2MH|K5DAT|K5DAT|WW6Q|WG3K|NS2B|N3IP|KA3VSP|N4SD
R:260423/1420Z 30523@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260423/1419z @:N2MH.#NNJ.NJ.USA.NOAM [via Mesh] jnos 2.0p $:11791_N4SD
R:260423/1408Z @:K5DAT.NEWI.WI.USA.NA [ELK Grove Village, IL USA] #:4793 XrLin505c
R:260423/1408Z 36109@K5DAT.#NEWI.WI.USA.NOAM LinBPQ6.0.25
R:260423/1407Z 51595@WW6Q.#NEIN.IN.USA.NOAM LinBPQ6.0.25
R:260423/1406Z 32913@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.25
R:260423/1406Z 49794@NS2B.#WNY.NY.USA.NOAM BPQ6.0.25
R:260423/1406Z 66105@N3IP.#SEPA.PA.USA.NOAM BPQ6.0.24
R:260423/1405Z 1135@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260423/1231Z 11791@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 231231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 23 1230 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
# 3-Day Forecast
#
A. NOAA Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 23-Apr 25 2026 is 3.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 23-Apr 25 2026
Apr 23 Apr 24 Apr 25
00-03UT 2.33 2.33 2.33
03-06UT 3.00 2.67 2.67
06-09UT 2.33 2.67 2.33
09-12UT 2.00 1.67 2.00
12-15UT 0.67 1.33 1.33
15-18UT 2.00 2.00 1.67
18-21UT 2.67 2.00 2.00
21-00UT 3.00 2.33 2.67
Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No
significant transient or recurrent solar wind features are forecast.
B. NOAA Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.
Solar Radiation Storm Forecast for Apr 23-Apr 25 2026
Apr 23 Apr 24 Apr 25
S1 or greater 10% 10% 10%
Rationale: There is a slight chance for S1 (Minor) or greater solar
radiation storms through 25 Apr.
C. NOAA Radio Blackout Activity and Forecast
Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 23 2026 0848 UTC.
Radio Blackout Forecast for Apr 23-Apr 25 2026
Apr 23 Apr 24 Apr 25
R1-R2 55% 55% 55%
R3 or greater 20% 20% 20%
Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
slight chance for R3 (Strong) or greater blackouts on 23-25
Apr-primarily due to the flare potential from Regions 4419 and 4420, as
well as activity from regions beyond the East limb.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
Return To Bulletin List