121
FXXX10 KWNP 020031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Sep 02 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 Sep 02-Sep 04 2026 is 2.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Sep 02-Sep 04 2026

             Sep 02       Sep 03       Sep 04
00-03UT       2.00         1.67         1.33
03-06UT       1.67         1.67         1.67
06-09UT       1.67         1.33         1.67
09-12UT       1.33         0.33         1.33
12-15UT       0.33         0.67         1.00
15-18UT       1.33         1.33         1.33
18-21UT       1.33         1.33         1.67
21-00UT       1.67         1.33         1.33

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 Sep 02-Sep 04 2026

              Sep 02  Sep 03  Sep 04
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 Sep 02-Sep 04 2026

              Sep 02        Sep 03        Sep 04
R1-R2           10%           10%           10%
R3 or greater    1%            1%            1%

Rationale: Solar activity will likely reach low levels with isolated to
occasional C-class flare activity, with a slight chance for M-class
flares (R1-R2/Minor-Moderate), through 04 Sep.