Message:21257 In: SPACWX.USA
From: N4SDDate: Wed, 22 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11727_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260422/1335Z 30492@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260422/1335Z 16115@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260422/1329Z 1100@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260422/1232Z 11727@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 221231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 22 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 22-Apr 24 2026 is 3.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 22-Apr 24 2026
Apr 22 Apr 23 Apr 24
00-03UT 1.67 2.33 2.33
03-06UT 1.00 2.00 2.67
06-09UT 0.67 2.00 2.67
09-12UT 2.00 2.00 1.67
12-15UT 2.00 0.67 1.33
15-18UT 2.33 2.00 2.00
18-21UT 2.00 2.67 2.00
21-00UT 2.00 3.00 2.33
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 22-Apr 24 2026
Apr 22 Apr 23 Apr 24
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected.
No significant active region activity favorable for radiation storm
production is forecast.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Apr 22-Apr 24 2026
Apr 22 Apr 23 Apr 24
R1-R2 10% 10% 10%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 24 Apr - mainly due to the recent growth and
development of Region 4420.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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