Message:19391 In: SPACWX.USA
From: N4SDDate: Mon, 23 Mar 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <9658_N4SD>
Path: K7EK|K7EK|N3HYM|KA3VSP|N4SD
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R:260323/1253Z 44453@K7EK.#NOKY.KY.USA.NOAM BPQ6.0.25
R:260323/1251Z 58143@N3HYM.#FRDK.MD.USA.NOAM BPQ6.0.24
R:260323/1232Z 55974@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260323/1231Z 9658@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 231231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Mar 23 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 7 (NOAA Scale
G3).
The greatest expected 3 hr Kp for Mar 23-Mar 25 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Mar 23-Mar 25 2026
Mar 23 Mar 24 Mar 25
00-03UT 4.67 (G1) 4.00 3.00
03-06UT 3.67 3.67 3.67
06-09UT 1.67 3.00 2.67
09-12UT 2.67 2.33 2.67
12-15UT 3.00 2.33 2.00
15-18UT 3.00 2.33 2.00
18-21UT 3.33 2.67 2.67
21-00UT 3.67 3.00 2.67
Rationale: Periods of G1 (Minor) geomagnetic storming are
expected on 23 Mar in response to negative polarity CH HSS influences.
Periods of active conditions are expected on 24-25 Mar as negative
polarity CH HSS influences continue, but gradually diminish.
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 Mar 23-Mar 25 2026
Mar 23 Mar 24 Mar 25
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 Mar 23-Mar 25 2026
Mar 23 Mar 24 Mar 25
R1-R2 25% 20% 20%
R3 or greater 5% 1% 1%
Rationale: Solar activity is expected to be low with a chance for
M-class flares on 23 Mar, and is likely to be low with a slight chance
for an M-class flare on 24-25 Mar.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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