428
FXXX10 KWNP 261231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Oct 26 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Oct 26-Oct 28 2026 is 2.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Oct 26-Oct 28 2026

             Oct 26       Oct 27       Oct 28
00-03UT       0.33         1.67         1.33
03-06UT       1.00         1.33         1.33
06-09UT       1.00         1.33         1.67
09-12UT       2.00         1.33         1.33
12-15UT       1.33         1.33         1.33
15-18UT       1.33         1.33         1.33
18-21UT       1.67         1.67         1.67
21-00UT       1.67         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 Oct 26-Oct 28 2026

              Oct 26  Oct 27  Oct 28
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 26-Oct 28 2026

              Oct 26        Oct 27        Oct 28
R1-R2           15%           10%            5%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 26-27 Oct.