028
FXXX10 KWNP 300031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 Aug 30 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 Aug 30-Sep 01 2025 is 2.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Aug 30-Sep 01 2025

             Aug 30       Aug 31       Sep 01
00-03UT       1.67         2.67         2.67
03-06UT       1.33         2.00         2.67
06-09UT       1.33         2.33         2.67
09-12UT       1.33         2.33         2.00
12-15UT       1.33         2.33         1.67
15-18UT       1.33         2.33         1.67
18-21UT       1.67         2.33         0.67
21-00UT       1.67         2.67         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
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Aug 30-Sep 01 2025

              Aug 30  Aug 31  Sep 01
S1 or greater   20%     15%     10%

Rationale: There remains a slight chance for S1 (Minor) solar radiation
storm levels through 01 Sep.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Aug 29 2025 0416 UTC.

Radio Blackout Forecast for Aug 30-Sep 01 2025

              Aug 30        Aug 31        Sep 01
R1-R2           75%           75%           75%
R3 or greater   20%           20%           20%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with a
slight chance for R3 (Strong or greater) events through 01 Sep.