Message:23350 In: SPACWX.USA
From: N4SDDate: Sun, 31 May 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <14761_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260531/1554Z 31825@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260531/1554Z 18060@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260531/1545Z 2761@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260531/1231Z 14761@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 311231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 May 31 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 May 31-Jun 02 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown May 31-Jun 02 2026
May 31 Jun 01 Jun 02
00-03UT 3.67 3.67 2.33
03-06UT 3.00 3.00 2.00
06-09UT 2.00 2.67 1.67
09-12UT 1.67 2.00 1.33
12-15UT 2.33 2.67 1.00
15-18UT 2.67 2.00 1.67
18-21UT 4.00 2.67 1.67
21-00UT 3.67 2.67 2.00
Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No
significant transient or recurrent solar wind features are forecast.
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 May 31-Jun 02 2026
May 31 Jun 01 Jun 02
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 May 31-Jun 02 2026
May 31 Jun 01 Jun 02
R1-R2 25% 25% 25%
R3 or greater 5% 5% 5%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 31 May-02 Jun.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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