623
FXXX10 KWNP 211231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2025 Nov 21 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 Nov 21-Nov 23 2025 is 3.33 (below NOAA
Scale levels).

NOAA Kp index breakdown Nov 21-Nov 23 2025

             Nov 21       Nov 22       Nov 23
00-03UT       3.00         3.33         1.67
03-06UT       2.67         2.67         1.33
06-09UT       0.67         2.33         1.33
09-12UT       1.67         1.67         1.33
12-15UT       3.00         1.33         1.33
15-18UT       2.33         1.33         1.33
18-21UT       2.67         1.33         1.67
21-00UT       2.67         2.00         1.67

Rationale: No G1 (Minor) or greater geomagnetic storms are expected.

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 Nov 21-Nov 23 2025

              Nov 21  Nov 22  Nov 23
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 Nov 21-Nov 23 2025

              Nov 21        Nov 22        Nov 23
R1-R2           15%           15%           15%
R3 or greater    1%            1%            1%

Rationale: There exists a slight chance for R1-R2 (Minor-Moderate) radio
blackouts over 21-23 Nov.