Message:21064 In: SPACWX.USA
From: N4SDDate: Sun, 19 Apr 26 00:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11448_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260419/0212Z 30380@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260419/0212Z 15932@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260419/0203Z 940@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260419/0032Z 11448@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 190031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 19 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for Apr 19-Apr 21 2026 is 5.00 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 19-Apr 21 2026
Apr 19 Apr 20 Apr 21
00-03UT 4.67 (G1) 3.67 3.33
03-06UT 5.00 (G1) 3.67 4.00
06-09UT 4.67 (G1) 3.33 3.00
09-12UT 3.67 3.33 2.67
12-15UT 3.00 3.33 2.33
15-18UT 2.67 2.00 3.00
18-21UT 3.00 3.33 2.67
21-00UT 3.00 3.33 2.33
Rationale: G1 (Minor) geomagnetic storming is expected on 19 Apr due to
persistant CH HSS effects.
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 19-Apr 21 2026
Apr 19 Apr 20 Apr 21
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 19-Apr 21 2026
Apr 19 Apr 20 Apr 21
R1-R2 15% 15% 15%
R3 or greater 1% 1% 1%
Rationale: A slight chance for an isolated R1-2 (Minor-Moderate) radio
blackout event will persist through 21 Apr primarily due to the flare
potential currently exhibited by Region 4419.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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