Message:20561 In: SPACWX.USA
From: N4SDDate: Fri, 10 Apr 26 00:42:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <10853_N4SD>
Path: K7EK|N3HYM|KA3VSP|N4SD
R:260410/0221z @:K7EK.#NOKY.KY.USA.NOAM $:10853_N4SD
R:260410/0218Z 59533@N3HYM.#FRDK.MD.USA.NOAM BPQ6.0.24
R:260410/0215Z 56781@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260410/0042Z 10853@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 100031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 10 0030 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 10-Apr 12 2026 is 5.33 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 10-Apr 12 2026
Apr 10 Apr 11 Apr 12
00-03UT 3.33 5.33 (G1) 4.33
03-06UT 5.00 (G1) 4.00 3.67
06-09UT 4.33 4.00 2.67
09-12UT 3.67 3.33 2.33
12-15UT 2.67 3.67 3.00
15-18UT 2.67 4.00 2.33
18-21UT 2.67 4.67 (G1) 3.00
21-00UT 4.33 4.67 (G1) 3.33
Rationale: G1 (Minor) storm levels are likely over 10-11 Apr due to the
influence of a +CH HSS.
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 10-Apr 12 2026
Apr 10 Apr 11 Apr 12
S1 or greater 5% 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
Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 09 2026 0845 UTC.
Radio Blackout Forecast for Apr 10-Apr 12 2026
Apr 10 Apr 11 Apr 12
R1-R2 25% 5% 5%
R3 or greater 1% 1% 1%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
on 10 Apr.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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