Message 24382 in SPACWX.USA
From: N4SD
Date: Thu, 18 Jun 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <16374_N4SD>
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FXXX10 KWNP 181231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Jun 18 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 18-Jun 20 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Jun 18-Jun 20 2026
Jun 18 Jun 19 Jun 20
00-03UT 2.00 3.00 3.00
03-06UT 1.67 4.00 3.67
06-09UT 0.67 3.67 2.67
09-12UT 2.00 3.00 2.33
12-15UT 1.67 3.00 2.00
15-18UT 1.33 2.00 2.00
18-21UT 1.33 1.67 2.33
21-00UT 2.67 3.00 3.00
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 Jun 18-Jun 20 2026
Jun 18 Jun 19 Jun 20
S1 or greater 1% 1% 1%
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 18-Jun 20 2026
Jun 18 Jun 19 Jun 20
R1-R2 10% 15% 15%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 20 Jun.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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