Message:21182 In: SPACWX.USA
From: N4SDDate: Mon, 20 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11570_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260421/0212Z 30447@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260421/0211Z 16044@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260421/0206Z 1033@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260420/1232Z 11570@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 201231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 20 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 20-Apr 22 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 20-Apr 22 2026
Apr 20 Apr 21 Apr 22
00-03UT 0.67 3.33 2.67
03-06UT 2.33 4.00 2.00
06-09UT 4.00 3.00 2.33
09-12UT 3.67 2.67 2.00
12-15UT 3.67 2.33 2.00
15-18UT 3.00 3.00 2.33
18-21UT 3.00 2.67 2.00
21-00UT 2.67 2.33 2.00
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 20-Apr 22 2026
Apr 20 Apr 21 Apr 22
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 20-Apr 22 2026
Apr 20 Apr 21 Apr 22
R1-R2 5% 5% 10%
R3 or greater 1% 1% 1%
Rationale: No R1 (Minor) or greater radio blackouts are expected. No
significant active region flare activity is forecast.
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73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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