Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
623
FXXX10 KWNP 121231
DAYTDF
:Product: 3-Day Forecast
:Issued: 2026 Aug 12 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 Aug 12-Aug 14 2026 is 3.67 (below NOAA
Scale levels).
NOAA Kp index breakdown Aug 12-Aug 14 2026
Aug 12 Aug 13 Aug 14
00-03UT 1.67 1.67 2.00
03-06UT 2.67 2.00 1.67
06-09UT 2.00 1.67 1.33
09-12UT 2.33 2.00 2.33
12-15UT 2.00 1.67 3.00
15-18UT 1.33 1.67 2.67
18-21UT 2.00 2.00 3.33
21-00UT 2.00 1.67 3.67
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-18 over the past 24 hours, was
below S-scale storm level thresholds.
Solar Radiation Storm Forecast for Aug 12-Aug 14 2026
Aug 12 Aug 13 Aug 14
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 Aug 12-Aug 14 2026
Aug 12 Aug 13 Aug 14
R1-R2 10% 10% 10%
R3 or greater 1% 1% 1%
Rationale: A slight chance for R1-R2 (Minor-Moderate) radio blackouts
due to isolated M-class flare activity will persist through 14 Aug given
the current rate of development of Regions 4503, 4506 and 4506.