Message:18621 In: SPACWX.USA
From: N4SDDate: Wed, 11 Mar 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <8834_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260311/1609Z 28865@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260311/1605Z 13143@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260311/1601Z 55400@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260311/1232Z 8834@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 111231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Mar 11 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Mar 11-Mar 13 2026 is 5.00 (NOAA Scale
G1).
NOAA Kp index breakdown Mar 11-Mar 13 2026
Mar 11 Mar 12 Mar 13
00-03UT 3.33 1.67 1.67
03-06UT 3.67 1.33 1.33
06-09UT 2.00 1.33 1.33
09-12UT 1.33 1.33 2.67
12-15UT 1.00 1.33 3.33
15-18UT 1.33 1.67 5.00 (G1)
18-21UT 1.00 1.33 4.33
21-00UT 1.67 1.67 4.33
Rationale: Isolated periods of G1 (Minor) storming are possible on 13
Mar because of the onset of a positive polarity coronal hole high speed
stream (+CH HSS).
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 Mar 11-Mar 13 2026
Mar 11 Mar 12 Mar 13
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 Mar 11-Mar 13 2026
Mar 11 Mar 12 Mar 13
R1-R2 20% 20% 20%
R3 or greater 1% 1% 1%
Rationale: There exists a slight chance for R1-R2 (Minor-Moderate) radio
blackouts over 11-13 Mar.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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