Message 29782 in SPACWX.USA
From: N4SD
Date: Fri, 11 Sep 26 00:39:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <22309_N4SD>
Path: K7EK|K5DAT|W0ARP|WD0HDR|KE0GB|K1AJD|N3MEL|W3ND|N3FUD|KA3VSP|N4SD
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FXXX10 KWNP 110041
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Sep 11 0040 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 11-Sep 13 2026 is 3.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Sep 11-Sep 13 2026
Sep 11 Sep 12 Sep 13
00-03UT 2.00 2.33 2.33
03-06UT 2.33 2.67 2.00
06-09UT 2.00 2.67 2.33
09-12UT 2.00 2.33 2.33
12-15UT 2.33 1.33 2.33
15-18UT 2.67 1.00 2.33
18-21UT 2.67 2.00 2.67
21-00UT 3.00 2.33 2.67
Rationale: No G1 (Minor) or greater geomagnetic storms are expected
through 13 Sep.
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 11-Sep 13 2026
Sep 11 Sep 12 Sep 13
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected
through 13 Sep.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Sep 11-Sep 13 2026
Sep 11 Sep 12 Sep 13
R1-R2 10% 10% 10%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 13 Sep.
------
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More Info: N4SD@N4SD.#TIDE.VA.USA.NOAM
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