Message:24714 In: SPACWX.USA
From: N4SDDate: Fri, 26 Jun 26 00:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <17062_N4SD>
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FXXX10 KWNP 260031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Jun 26 0030 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 26-Jun 28 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Jun 26-Jun 28 2026
Jun 26 Jun 27 Jun 28
00-03UT 3.33 3.00 3.33
03-06UT 3.67 3.67 3.67
06-09UT 2.00 2.00 4.00
09-12UT 1.67 2.67 3.00
12-15UT 2.00 2.00 2.00
15-18UT 2.33 2.00 1.67
18-21UT 3.00 2.67 2.67
21-00UT 3.00 3.00 2.67
Rationale: No G1 (Minor) or greater geomagnetic storms are expected.
Periods of active conditions are likely under negative polarity coronal
hole high speed stream 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 26-Jun 28 2026
Jun 26 Jun 27 Jun 28
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 26-Jun 28 2026
Jun 26 Jun 27 Jun 28
R1-R2 50% 50% 50%
R3 or greater 10% 10% 10%
Rationale: There is a high chance for R1-R2 (Minor-Moderate) radio
blackouts 26-28 Jun due primarily to the flare potential of Region 4478.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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