Message 28992 in SPACWX.USA
From: N4SD
Date: Sat, 29 Aug 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <21572_N4SD>
Path: K7EK|K5DAT|WW6Q|W9GM|KA3BVJ|KA3VSP|N3MEL|N4SD
R:260829/1545z @:K7EK.#NOKY.KY.USA.NOAM $:21572_N4SD
R:260829/1538Z 51271@K5DAT.#NEWI.WI.USA.NOAM LinBPQ6.0.25
R:260829/1538Z 58858@WW6Q.#NEIN.IN.USA.NOAM LinBPQ6.0.25
R:260829/1537Z 8422@W9GM.#SWWI.WI.USA.NOAM BPQ6.0.24
R:260829/1537Z 86065@KA3BVJ.#EPA.PA.USA.NOAM BPQ1.4.65
R:260829/1537Z 7197@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260829/1535Z 25633@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260829/1231Z 21572@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 291231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Aug 29 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Aug 29-Aug 31 2026 is 5.67 (NOAA Scale
G2).
NOAA Kp index breakdown Aug 29-Aug 31 2026
Aug 29 Aug 30 Aug 31
00-03UT 4.33 2.67 1.67
03-06UT 3.33 3.67 2.00
06-09UT 3.67 3.67 1.67
09-12UT 3.00 2.67 1.67
12-15UT 3.00 1.67 1.00
15-18UT 3.67 1.00 1.00
18-21UT 4.67 (G1) 1.67 0.67
21-00UT 5.67 (G2) 2.67 2.00
Rationale: Periods of G1-G2 (Minor-Moderate) geomagnetic storming are
likely on 29 Aug due to positive polarity CH HSS influences, coupled
with the anticipated arrival of CMEs that left the Sun on 25-26 Aug.
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 Aug 29-Aug 31 2026
Aug 29 Aug 30 Aug 31
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 Aug 29-Aug 31 2026
Aug 29 Aug 30 Aug 31
R1-R2 25% 25% 25%
R3 or greater 1% 1% 1%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
on 29-31 Aug.
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