3-Day Forecast

Issued: 2025 Apr 29 0030 UTC
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center and processed by SpaceWeatherLive.com

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 Apr 29-May 01 2025 is 2 (.67below NOAA Scale levels).

NOAA Kp index breakdown

             Apr 29       Apr 30       May 01
00-03UT       2.67         1.67         1.33     
03-06UT       2.33         1.33         1.33     
06-09UT       2.00         1.33         1.33     
09-12UT       2.00         1.33         1.33     
12-15UT       2.00         1.33         1.67     
15-18UT       1.67         1.33         1.33     
18-21UT       2.33         1.67         1.67     
21-00UT       2.33         1.67         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 Apr 29-May 01 2025

              Apr 29  Apr 30  May 01
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 Apr 29-May 01 2025

              Apr 29        Apr 30        May 01
R1-R2           15%           15%           20%
R3 or greater    1%            1%            1%

Rationale

Solar activity is expected to be low with a slight chance for M-class flares (R1-R2, Minor-Moderate) through 01 May.