Message 24765 in SPACWX.USA
From: N4SD
Date: Sat, 27 Jun 26 00:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <17153_N4SD>
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FXXX10 KWNP 270031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Jun 27 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 27-Jun 29 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Jun 27-Jun 29 2026
Jun 27 Jun 28 Jun 29
00-03UT 3.00 3.33 1.67
03-06UT 3.67 3.67 1.33
06-09UT 3.00 4.00 1.33
09-12UT 2.00 3.00 1.33
12-15UT 2.00 2.00 1.33
15-18UT 2.00 1.67 1.33
18-21UT 2.33 2.67 1.67
21-00UT 3.00 2.67 1.67
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 Jun 27-Jun 29 2026
Jun 27 Jun 28 Jun 29
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 27-Jun 29 2026
Jun 27 Jun 28 Jun 29
R1-R2 50% 50% 50%
R3 or greater 10% 10% 10%
Rationale: A high chance for R1-2 (Minor-Moderate) radio blackouts will
persist through 29 June primarily due to the flare potential of active
regions 4475 and 4478.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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