Message:19801 In: SPACWX.USA
From: N4SDDate: Sun, 29 Mar 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <10034_N4SD>
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FXXX10 KWNP 291231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Mar 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 Mar 29-Mar 31 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Mar 29-Mar 31 2026
Mar 29 Mar 30 Mar 31
00-03UT 3.67 3.67 3.67
03-06UT 3.67 4.67 (G1) 3.00
06-09UT 3.33 3.00 2.67
09-12UT 2.33 2.33 2.00
12-15UT 1.67 2.33 2.00
15-18UT 1.67 2.33 2.33
18-21UT 0.67 3.00 2.67
21-00UT 1.00 3.67 2.67
Rationale: G1 (Minor) geomagnetic storming is likely on 30 Mar in
response to +CH HSS influences.
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 29-Mar 31 2026
Mar 29 Mar 30 Mar 31
S1 or greater 5% 5% 5%
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 29-Mar 31 2026
Mar 29 Mar 30 Mar 31
R1-R2 50% 50% 50%
R3 or greater 10% 10% 10%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
and a slight chance for an R3 (Strong) event, on 29-31 Mar.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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