Message:21479 In: SPACWX.USA
From: N4SDDate: Mon, 27 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <12063_N4SD>
Path: N2MH4|N2MH|K5DAT|K5DAT|WW6Q|W9GM|KA3BVJ|N3IP|KA3VSP|N4SD
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R:260427/1355z @:N2MH.#NNJ.NJ.USA.NOAM [via Mesh] jnos 2.0p $:12063_N4SD
R:260427/1351Z @:K5DAT.NEWI.WI.USA.NA [ELK Grove Village, IL USA] #:4944 XrLin505c
R:260427/1351Z 36432@K5DAT.#NEWI.WI.USA.NOAM LinBPQ6.0.25
R:260427/1350Z 51810@WW6Q.#NEIN.IN.USA.NOAM LinBPQ6.0.25
R:260427/1350Z 58298@W9GM.#SWWI.WI.USA.NOAM BPQ6.0.25
R:260427/1349Z 80620@KA3BVJ.#EPA.PA.USA.NOAM BPQ1.4.65
R:260427/1349Z 66314@N3IP.#SEPA.PA.USA.NOAM BPQ6.0.24
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R:260427/1232Z 12063@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 271231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 27 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 27-Apr 29 2026 is 3.33 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 27-Apr 29 2026
Apr 27 Apr 28 Apr 29
00-03UT 3.00 1.67 2.00
03-06UT 2.00 1.33 2.33
06-09UT 1.00 1.33 1.67
09-12UT 1.33 1.33 1.33
12-15UT 2.00 1.67 1.00
15-18UT 1.33 1.33 2.67
18-21UT 2.33 1.33 3.00
21-00UT 2.33 1.67 3.33
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 Apr 27-Apr 29 2026
Apr 27 Apr 28 Apr 29
S1 or greater 10% 10% 10%
Rationale: There is a slight chance the greater than 10 MeV proton flux
could reach S1 (Minor) levels, but is mainly expected to remain at
background levels 27-29 Apr.
C. NOAA Radio Blackout Activity and Forecast
Radio blackouts reaching the R2 levels were observed over the past 24
hours. The largest was at Apr 26 2026 2257 UTC.
Radio Blackout Forecast for Apr 27-Apr 29 2026
Apr 27 Apr 28 Apr 29
R1-R2 70% 70% 70%
R3 or greater 25% 25% 25%
Rationale: There is a high likelihood for R1/R2 (Minor/Moderate) radio
blackouts, and a slight chance for R3 (Strong or greater) events through
29 Apr, due primarily to the complexity of regions 4420 and 4425.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
Received via NOAA GOES-East satellite downlink
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