Message:24690 In: SPACWX.USA
From: N4SDDate: Thu, 25 Jun 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <17032_N4SD>
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FXXX10 KWNP 251231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Jun 25 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Jun 25-Jun 27 2026 is 5.00 (NOAA Scale
G1).
NOAA Kp index breakdown Jun 25-Jun 27 2026
Jun 25 Jun 26 Jun 27
00-03UT 4.33 3.33 3.00
03-06UT 5.00 (G1) 3.67 3.67
06-09UT 3.67 2.00 2.00
09-12UT 2.67 1.67 2.67
12-15UT 4.67 3.00 2.00
15-18UT 1.67 3.67 2.00
18-21UT 2.67 3.33 2.67
21-00UT 3.67 3.00 3.00
Rationale: G1 (Minor) geomagnetic storms are expected on 25 Jun due 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 Jun 25-Jun 27 2026
Jun 25 Jun 26 Jun 27
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 Jun 25-Jun 27 2026
Jun 25 Jun 26 Jun 27
R1-R2 50% 50% 50%
R3 or greater 10% 10% 10%
Rationale: There is a high chance for R1-R2 (Minor-Moderate) radio
blackouts 25-27 Jun due primarily to the flare potential of Region 4478.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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