Message 30310 in SPACWX.USA
From: N4SD
Date: Sun, 20 Sep 26 00:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <22723_N4SD>
Path: K7EK|N3MEL|KA3VSP|N4SD
R:260920/0040z @:K7EK.#NOKY.KY.USA.NOAM $:22723_N4SD
R:260920/0035Z 27229@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260920/0032Z 8362@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260920/0031Z 22723@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 200031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Sep 20 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Sep 20-Sep 22 2026 is 2.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Sep 20-Sep 22 2026
Sep 20 Sep 21 Sep 22
00-03UT 1.67 1.67 1.67
03-06UT 2.00 2.00 1.33
06-09UT 1.67 1.67 1.33
09-12UT 1.33 1.33 1.33
12-15UT 0.67 0.67 1.33
15-18UT 1.33 1.33 1.33
18-21UT 1.33 1.33 1.67
21-00UT 1.67 1.67 1.67
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 Sep 20-Sep 22 2026
Sep 20 Sep 21 Sep 22
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 Sep 20-Sep 22 2026
Sep 20 Sep 21 Sep 22
R1-R2 1% 1% 1%
R3 or greater 1% 1% 1%
Rationale: No R1 (Minor) or greater radio blackouts are expected. No
significant active region flare activity is forecast.
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