Message:24341 In: SPACWX.USA
From: N4SDDate: Wed, 17 Jun 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <16299_N4SD>
Path: K7EK|N3HYM|KA3VSP|N4SD
R:260617/1911z @:K7EK.#NOKY.KY.USA.NOAM $:16299_N4SD
R:260617/1910Z 7459@N3HYM.#FRDK.MD.USA.NOAM BPQ6.0.25
R:260617/1909Z 3549@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260617/1231Z 16299@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 171231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Jun 17 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 17-Jun 19 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Jun 17-Jun 19 2026
Jun 17 Jun 18 Jun 19
00-03UT 1.67 3.33 3.00
03-06UT 1.33 3.00 4.00
06-09UT 2.00 2.33 3.67
09-12UT 1.67 2.00 3.00
12-15UT 1.33 1.67 3.00
15-18UT 2.67 1.33 2.00
18-21UT 4.00 1.33 1.67
21-00UT 3.00 2.67 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 17-Jun 19 2026
Jun 17 Jun 18 Jun 19
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 17-Jun 19 2026
Jun 17 Jun 18 Jun 19
R1-R2 15% 15% 15%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 19 Jun.
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73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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