Message:18579 In: SPACWX.USA
From: N4SDDate: Wed, 11 Mar 26 00:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <8800_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260311/0400Z 28837@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260311/0355Z 13102@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260311/0349Z 55372@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260311/0032Z 8800@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 110031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Mar 11 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 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 2.67 1.67 1.67
03-06UT 2.33 1.33 1.33
06-09UT 2.00 1.33 1.33
09-12UT 2.00 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 negative 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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