Message:19948 In: SPACWX.USA
From: N4SDDate: Wed, 01 Apr 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <10229_N4SD>
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FXXX10 KWNP 011231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 01 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 01-Apr 03 2026 is 5.00 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 01-Apr 03 2026
Apr 01 Apr 02 Apr 03
00-03UT 3.00 2.00 4.33
03-06UT 1.33 1.67 4.00
06-09UT 1.33 1.67 3.33
09-12UT 1.67 2.33 3.33
12-15UT 4.00 3.67 2.67
15-18UT 3.67 5.00 (G1) 2.33
18-21UT 2.33 4.33 2.33
21-00UT 3.67 5.00 (G1) 3.67
Rationale: The geomagnetic field is expected to be at unsettled to
active periods for the rest of the UTC day on 01 Apr with G1-G2
(Minor-Moderate)
storming possible as CME effects persist. Active to G1 (Minor) storming
is likely on 02 Apr with the onset of a negative polarity CH HSS.
Unsettled to active levels are expected to persist through 03 Apr.
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 Apr 01-Apr 03 2026
Apr 01 Apr 02 Apr 03
S1 or greater 15% 15% 15%
Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels through 03 Apr.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Apr 01-Apr 03 2026
Apr 01 Apr 02 Apr 03
R1-R2 55% 55% 55%
R3 or greater 20% 20% 20%
Rationale: Solar activity is likely to reach moderate levels with R1-R2
(Minor-Moderate) flaring, with slight chance for X-class flares through
03 Apr, due primarily to the flare potential of Region 4405.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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