Message:21361 In: SPACWX.USA
From: N4SDDate: Fri, 24 Apr 26 14:30:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11866_N4SD>
Path: N2MH4|N2MH|K5DAT|K5DAT|WW6Q|W9GM|KA3BVJ|KA3VSP|N4SD
R:260424/1447Z 30563@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260424/1446z @:N2MH.#NNJ.NJ.USA.NOAM [via Mesh] jnos 2.0p $:11866_N4SD
R:260424/1442Z @:K5DAT.NEWI.WI.USA.NA [ELK Grove Village, IL USA] #:4837 XrLin505c
R:260424/1442Z 36214@K5DAT.#NEWI.WI.USA.NOAM LinBPQ6.0.25
R:260424/1441Z 51660@WW6Q.#NEIN.IN.USA.NOAM LinBPQ6.0.25
R:260424/1441Z 58081@W9GM.#SWWI.WI.USA.NOAM BPQ6.0.25
R:260424/1440Z 80508@KA3BVJ.#EPA.PA.USA.NOAM BPQ1.4.65
R:260424/1439Z 1189@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260424/1430Z 11866@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 241231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 24 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 24-Apr 26 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 24-Apr 26 2026
Apr 24 Apr 25 Apr 26
00-03UT 2.67 3.00 3.67
03-06UT 1.33 2.67 3.33
06-09UT 2.33 2.33 3.00
09-12UT 1.33 2.00 2.33
12-15UT 1.33 2.00 3.67
15-18UT 2.00 2.33 4.67 (G1)
18-21UT 2.00 3.33 4.33
21-00UT 2.33 3.67 3.33
Rationale: Isolated G1-G2 (Minor-Moderate) geomagnetic storming
conditions are possible late on 25 Apr into early 26 Apr in response to
the arrival of the glancing CMEs.
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 24-Apr 26 2026
Apr 24 Apr 25 Apr 26
S1 or greater 25% 25% 20%
Rationale: There is a chance for S1 (Minor) solar radiation storms due
to the flare activity of Region 4419 as it rotates toward the western
limb and Region 4420 as it approaches central solar meridian.
C. NOAA Radio Blackout Activity and Forecast
Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at Apr 24 2026 0813 UTC.
Radio Blackout Forecast for Apr 24-Apr 26 2026
Apr 24 Apr 25 Apr 26
R1-R2 75% 75% 75%
R3 or greater 35% 35% 30%
Rationale: (R1-R2-Moderate) radio blackouts are expected through 26 Apr,
with a chance for R3 (Strong or greater) radio blackouts, primarily
driven by the ongoing complexity of Regions 4419 and 4420.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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