Message:21676 In: SPACWX.USA
From: N4SDDate: Thu, 30 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <12260_N4SD>
Path: N2MH4|WB4WPF|KA3VSP|N4SD
R:260430/1415Z 30766@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260430/1415Z 11231@WB4WPF.#SFL.FL.USA.NOAM LinBPQ6.0.25
R:260430/1405Z 1427@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260430/1232Z 12260@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 301231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 30 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 30-May 02 2026 is 2.67 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 30-May 02 2026
Apr 30 May 01 May 02
00-03UT 2.00 2.67 1.67
03-06UT 2.33 2.33 1.67
06-09UT 2.67 2.33 1.67
09-12UT 2.00 2.00 1.33
12-15UT 1.67 2.00 1.33
15-18UT 1.67 2.00 1.33
18-21UT 1.33 2.33 1.33
21-00UT 2.00 2.00 1.33
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 30-May 02 2026
Apr 30 May 01 May 02
S1 or greater 10% 10% 10%
Rationale: There is a slight chance the greater than 10 MeV proton flux
could reach S1 (Minor) levels, but is mainly expected to remain at
background levels 30 Apr - 02 May.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Apr 30-May 02 2026
Apr 30 May 01 May 02
R1-R2 65% 65% 65%
R3 or greater 10% 10% 10%
Rationale: There is a high likelihood for R1/R2 (Minor/Moderate) radio
blackouts, and a slight chance for R3 (Strong or greater) events through
02 May, due primarily to the complexity of regions 4420 and 4425.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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