516
FXXX10 KWNP 280031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 Aug 28 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Aug 28-Aug 30 2025 is 3.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Aug 28-Aug 30 2025

             Aug 28       Aug 29       Aug 30
00-03UT       3.00         2.33         1.67
03-06UT       2.67         2.67         1.33
06-09UT       2.33         2.00         1.33
09-12UT       2.33         1.67         1.33
12-15UT       2.00         1.67         1.33
15-18UT       2.00         2.00         1.33
18-21UT       2.33         2.00         1.67
21-00UT       2.33         2.33         1.67

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
above S-scale storm level thresholds.

Solar Radiation Storm Forecast for Aug 28-Aug 30 2025

              Aug 28  Aug 29  Aug 30
S1 or greater   50%     10%     10%

Rationale: The greater than 10 MeV proton flux is expected to continue a
slow, steady declining trend towards background levels over the course
of 28 August with a slight chance for an S1 (Minor) solar radiation
storm event remaining through 30 Aug.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Aug 28-Aug 30 2025

              Aug 28        Aug 29        Aug 30
R1-R2           60%           65%           65%
R3 or greater   10%           15%           15%

Rationale: Solar activity is likely to reach moderate (R1-R2,
Minor-Moderate) levels through 30 Aug due to M-class flare activity with
a slight chance for an isolated X-class flare (R3-Strong) event.