Message:22191 In: SPACWX.USA
From: N4SDDate: Mon, 11 May 26 00:31:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather 3-Day Forecast
Message-ID: <12995_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260511/0557Z 31090@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260511/0556Z 16952@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260511/0538Z 1864@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260511/0031Z 12995@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX10 KWNP 110031
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 May 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 11-May 13 2026 is 2.67 (below NOAA
Scale levels).
NOAA Kp index breakdown May 11-May 13 2026
May 11 May 12 May 13
00-03UT 1.67 1.67 1.67
03-06UT 2.67 1.67 2.67
06-09UT 2.67 1.33 2.67
09-12UT 1.67 1.33 2.33
12-15UT 1.33 1.33 2.33
15-18UT 1.33 0.67 2.00
18-21UT 2.00 1.67 2.33
21-00UT 2.67 1.67 2.67
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-19 over the past 24 hours, was
below S-scale storm level thresholds.
Solar Radiation Storm Forecast for May 11-May 13 2026
May 11 May 12 May 13
S1 or greater 20% 20% 20%
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
Radio blackouts reaching the R2 levels weOAA GOES-East satellite downlink
Return To Bulletin List