Message:20279 In: SPACWX.USA
From: N4SDDate: Sat, 04 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <10472_N4SD>
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FXXX10 KWNP 041231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 04 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 7 (NOAA Scale
G3).
The greatest expected 3 hr Kp for Apr 04-Apr 06 2026 is 5.67 (NOAA Scale
G2).
NOAA Kp index breakdown Apr 04-Apr 06 2026
Apr 04 Apr 05 Apr 06
00-03UT 4.67 (G1) 3.67 2.67
03-06UT 3.67 3.67 3.00
06-09UT 2.67 3.67 2.67
09-12UT 2.67 2.67 2.67
12-15UT 4.67 (G1) 2.67 2.00
15-18UT 4.00 2.00 1.67
18-21UT 3.00 2.67 1.67
21-00UT 5.67 (G2) 2.67 2.67
Rationale: The geomagnetic field is expected to reach G1 (Minor) storm
levels on 04 Apr, with periods of G2 (Moderate) storming likely, due to
waning CME effects and negative polarity 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 04-Apr 06 2026
Apr 04 Apr 05 Apr 06
S1 or greater 20% 20% 20%
Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels over 04-06 Apr.
C. NOAA Radio Blackout Activity and Forecast
Radio blackouts reaching the R2 levels were observed over the past 24
hours. The largest was at Apr 04 2026 0117 UTC.
Radio Blackout Forecast for Apr 04-Apr 06 2026
Apr 04 Apr 05 Apr 06
R1-R2 55% 55% 55%
R3 or greater 20% 20% 20%
Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
slight chance for an R3 (Strong) or greater event, on 04-06 Apr.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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