344
FXXX10 KWNP 091231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 May 09 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 May 09-May 11 2026 is 2.67 (below NOAA
Scale levels).

NOAA Kp index breakdown May 09-May 11 2026

             May 09       May 10       May 11
00-03UT       2.33         2.67         1.67
03-06UT       1.33         2.00         2.67
06-09UT       1.00         2.00         2.67
09-12UT       1.67         1.67         1.67
12-15UT       2.00         1.00         1.33
15-18UT       1.67         0.67         1.33
18-21UT       2.00         1.00         2.00
21-00UT       2.67         1.67         2.67

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-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 09-May 11 2026

              May 09  May 10  May 11
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 May 09-May 11 2026

              May 09        May 10        May 11
R1-R2           45%           45%           45%
R3 or greater   10%           10%           10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
and a slight chance for an R3 (Strong or greater) event.