Message:24356 In: SPACWX.USA
From: N4SDDate: Thu, 18 Jun 26 00:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <16354_N4SD>
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FXXX10 KWNP 180031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Jun 18 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 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 3.33 3.00 3.00
03-06UT 3.00 4.00 3.67
06-09UT 2.33 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
through Jun 20.
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
through Jun 20.
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 of R1-R2 (Minor-Moderate) radio
blackouts through Jun 20.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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