Message:21567 In: SPACWX.USA
From: N4SDDate: Tue, 28 Apr 26 12:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <12141_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260428/1411Z 30688@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260428/1410Z 16404@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260428/1403Z 1348@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260428/1231Z 12141@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 281231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Apr 28 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 Apr 28-Apr 30 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 28-Apr 30 2026
Apr 28 Apr 29 Apr 30
00-03UT 0.67 2.00 4.00
03-06UT 0.67 2.33 3.33
06-09UT 0.67 1.67 2.67
09-12UT 1.00 1.33 3.00
12-15UT 1.67 2.00 2.33
15-18UT 1.67 3.00 2.33
18-21UT 1.67 3.33 2.00
21-00UT 2.00 4.00 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 Apr 28-Apr 30 2026
Apr 28 Apr 29 Apr 30
S1 or greater 15% 15% 15%
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 28-30 Apr.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over high likelihood for R1/R2 (Minor/Moderate) radio
blackouts, and a slight chance for R3 (Strong or greater) events through
30 Apr, due primarily to the complexity of regions 4420 and 4425.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USAhigh likelihood for R1/R2 (Minor/Moderate) radio
blackouts, and a slight chance for R3 (Strong or greater) events through
30 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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