Message:20519 In: SPACWX.USA
From: N4SDDate: Thu, 09 Apr 26 00:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <10792_N4SD>
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FXXX10 KWNP 090031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 09 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 09-Apr 11 2026 is 5.00 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 09-Apr 11 2026
Apr 09 Apr 10 Apr 11
00-03UT 3.33 2.33 4.67 (G1)
03-06UT 3.00 5.00 (G1) 4.00
06-09UT 1.67 4.67 (G1) 4.00
09-12UT 1.00 3.67 4.00
12-15UT 0.67 2.67 4.00
15-18UT 1.33 2.67 4.00
18-21UT 1.33 3.67 4.67 (G1)
21-00UT 1.67 4.00 4.67 (G1)
Rationale: G1 (Minor) or greater geomagnetic storms are likely on 10 and
11 Apr due to the onset of a positive polarity coronal hole high speed
stream influence.
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 09-Apr 11 2026
Apr 09 Apr 10 Apr 11
S1 or greater 10% 10% 10%
Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm level on 09-11 Apr.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Apr 09-Apr 11 2026
Apr 09 Apr 10 Apr 11
R1-R2 35% 35% 25%
R3 or greater 10% 10% 5%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
through 11 Apr, with a slight chance for R3 (Strong) or greater events
through 10 Apr.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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