Message:20751 In: SPACWX.USA
From: N4SDDate: Mon, 13 Apr 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11078_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260413/1408Z 30169@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260413/1407Z 15588@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260413/1403Z 710@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260413/1231Z 11078@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 131231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 13 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 13-Apr 15 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 13-Apr 15 2026
Apr 13 Apr 14 Apr 15
00-03UT 0.67 1.67 2.67
03-06UT 1.00 2.67 3.00
06-09UT 1.00 1.67 4.00
09-12UT 1.00 1.67 2.67
12-15UT 1.67 1.00 2.67
15-18UT 1.67 0.67 1.67
18-21UT 1.67 1.67 1.67
21-00UT 2.67 2.00 2.00
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 13-Apr 15 2026
Apr 13 Apr 14 Apr 15
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 13-Apr 15 2026
Apr 13 Apr 14 Apr 15
R1-R2 10% 10% 10%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 13-15 Apr.
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73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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