FXXX10 KWNP 280031

DAYTDF



:Product: 3-Day Forecast

:Issued: 2025 Oct 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 Oct 28-Oct 30 2025 is 5.00 (NOAA Scale

G1).



NOAA Kp index breakdown Oct 28-Oct 30 2025



             Oct 28       Oct 29       Oct 30

00-03UT       4.00         4.33         4.67 (G1)

03-06UT       4.67 (G1)    5.00 (G1)    4.00     

06-09UT       5.00 (G1)    4.33         4.00     

09-12UT       4.33         3.67         3.67     

12-15UT       4.33         3.00         3.67     

15-18UT       4.33         4.00         4.00     

18-21UT       3.67         4.67 (G1)    3.33     

21-00UT       4.67 (G1)    4.00         3.33     



Rationale: G1 (Minor) conditions, with a chance for G2 (Moderate)

levels, are likely on 28-30 Oct due to the anticipated onset of

influence from a positive polarity coronal hole.



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 Oct 28-Oct 30 2025



              Oct 28  Oct 29  Oct 30

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 Oct 28-Oct 30 2025



              Oct 28        Oct 29        Oct 30

R1-R2            5%            5%            5%

R3 or greater    1%            1%            1%



Rationale: No R1 (Minor) or greater radio blackouts are expected.  No

significant active region flare activity is forecast.