Message:20671 In: SPACWX.USA
From: N4SDDate: Sat, 11 Apr 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <10951_N4SD>
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R:260411/1547Z 74611@VE3CGR.#SCON.ON.CAN.NOAM LinBPQ6.0.25
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FXXX10 KWNP 111231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 11 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 11-Apr 13 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 11-Apr 13 2026
Apr 11 Apr 12 Apr 13
00-03UT 2.00 2.67 2.67
03-06UT 4.00 3.67 3.00
06-09UT 3.33 3.67 2.67
09-12UT 3.33 2.67 1.67
12-15UT 3.00 2.00 1.67
15-18UT 2.67 1.67 1.67
18-21UT 3.67 1.67 2.00
21-00UT 4.67 (G1) 2.67 2.67
Rationale: G1 (Minor) geomagnetic storming is likely on 11 Apr due to
+CH HSS influences.
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 11-Apr 13 2026
Apr 11 Apr 12 Apr 13
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 11-Apr 13 2026
Apr 11 Apr 12 Apr 13
R1-R2 5% 5% 5%
R3 or greater 1% 1% 1%
Rationale: No R1 (Minor) or greater radio blackouts are expected. No
significant active region flare activity is forecast.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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