Message:19231 In: SPACWX.USA
From: N4SDDate: Fri, 20 Mar 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <9406_N4SD>
Path: K7EK|K7EK|WW6Q|W9GM|KA3BVJ|KA3VSP|N4SD
R:260320/1355z @:K7EK.#NOKY.KY.USA.NOAM $:9406_N4SD
R:260320/1355Z 44220@K7EK.#NOKY.KY.USA.NOAM BPQ6.0.25
R:260320/1355Z 49458@WW6Q.#NEIN.IN.USA.NOAM LinBPQ6.0.25
R:260320/1355Z 55161@W9GM.#SWWI.WI.USA.NOAM BPQ6.0.25
R:260320/1354Z 78899@KA3BVJ.#EPA.PA.USA.NOAM BPQ1.4.65
R:260320/1353Z 55789@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260320/1232Z 9406@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 201231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Mar 20 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 20-Mar 22 2026 is 6.33 (NOAA Scale
G2).
NOAA Kp index breakdown Mar 20-Mar 22 2026
Mar 20 Mar 21 Mar 22
00-03UT 2.00 4.67 (G1) 4.67 (G1)
03-06UT 2.67 6.33 (G2) 5.00 (G1)
06-09UT 3.67 5.67 (G2) 4.33
09-12UT 3.67 5.33 (G1) 4.00
12-15UT 4.67 (G1) 4.33 2.67
15-18UT 4.67 (G1) 4.67 (G1) 3.33
18-21UT 6.00 (G2) 4.67 (G1) 4.33
21-00UT 6.33 (G2) 4.33 4.33
Rationale: The geomagnetic field is expected to be at active to G2
(Moderate) storm levels on 20 Mar as CMEs from 16-17 Mar are anticipated
to arrive. Additional G2 (Moderate) storm conditions are likely, with G3
(Strong) conditions possible, on 21 Mar as the CME from 18 Mar is
expected to arrive in conjunction with the onset of a negative polarity
CH HSS. Unsettled to G1 (Minor) levels are expected on 22 Mar as CME/CH
HSS effects persist.
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 20-Mar 22 2026
Mar 20 Mar 21 Mar 22
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Mar 20-Mar 22 2026
Mar 20 Mar 21 Mar 22
R1-R2 15% 15% 15%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 20-22 Mar.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
Return To Bulletin List