Message 29507 in SPACWX.USA
From: N4SD
Date: Sun, 06 Sep 26 12:30:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <22116_N4SD>
Path: K7EK|NS2B|N3IP|KA3VSP|N4SD
R:260906/1411z @:K7EK.#NOKY.KY.USA.NOAM $:22116_N4SD
R:260906/1409Z 869@NS2B.#WNY.NY.USA.NOAM LinBPQ6.0.25
R:260906/1409Z 74096@N3IP.#SEPA.PA.USA.NOAM BPQK6.0.24
R:260906/1406Z 7633@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260906/1230Z 22116@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 061231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Sep 06 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 Sep 06-Sep 08 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Sep 06-Sep 08 2026
Sep 06 Sep 07 Sep 08
00-03UT 1.33 3.33 4.00
03-06UT 1.33 2.00 4.00
06-09UT 1.33 2.00 4.67 (G1)
09-12UT 1.33 3.00 4.67 (G1)
12-15UT 1.33 3.00 4.67 (G1)
15-18UT 1.33 3.33 4.00
18-21UT 1.33 3.67 3.67
21-00UT 1.67 4.00 3.33
Rationale: Isolated G1 (Minor) periods are likely if the CMEs from 05
Sep impact Earth as forecast.
B. NOAA Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
above S-scale storm level thresholds.
Solar Radiation Storm Forecast for Sep 06-Sep 08 2026
Sep 06 Sep 07 Sep 08
S1 or greater 75% 10% 10%
Rationale: The greater than 10 MeV proton flux is expected to continue
decreasing towards background levels through early 08 Sep, with a slight
chance for S1 (Minor) levels over the next three days.
C. NOAA Radio Blackout Activity and Forecast
Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Sep 05 2026 1518 UTC.
Radio Blackout Forecast for Sep 06-Sep 08 2026
Sep 06 Sep 07 Sep 08
R1-R2 20% 20% 20%
R3 or greater 5% 5% 5%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 08 Sep.
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