Message:20865 In: SPACWX.USA
From: N4SDDate: Wed, 15 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <11210_N4SD>
Path: N2MH4|N3MEL|N3FUD|KA3VSP|N4SD
R:260415/1407Z 30258@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260415/1407Z 15723@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260415/1405Z 6124@N3FUD.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260415/1404Z 797@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260415/1232Z 11210@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 151231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 15 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 1 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 15-Apr 17 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 15-Apr 17 2026
Apr 15 Apr 16 Apr 17
00-03UT 0.67 1.67 2.33
03-06UT 1.33 2.67 2.67
06-09UT 1.33 2.67 4.00
09-12UT 0.67 2.33 3.67
12-15UT 2.67 1.67 3.33
15-18UT 2.33 1.67 2.67
18-21UT 2.33 1.67 3.33
21-00UT 1.67 2.33 3.67
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 15-Apr 17 2026
Apr 15 Apr 16 Apr 17
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 15-Apr 17 2026
Apr 15 Apr 16 Apr 17
R1-R2 10% 15% 15%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 15-17 Apr, primarily due to the development of Region 4419.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
Return To Bulletin List