3-Day Forecast
NOAA Space Weather Prediction Center official outlook
Issued 2026 Aug 23 1230 UTC
Geomagnetic
Kp 2.00Below G1
Peak expected 3-hour Kp over the outlookSolar Radiation
25%Watch
Peak chance of S1 or greaterRadio Blackout
45%Watch
Peak chance of R1-R2Geomagnetic Activity
Predicted Kp index per 3-hour UTC window
QuietActiveG1–G2G3+
Aug 23todayAug 24Aug 25
00-03
0.67
1.67
1.67
03-06
2.00
1.67
1.67
06-09
1.67
1.67
1.33
09-12
2.00
1.33
1.33
12-15
1.33
0.67
1.33
15-18
1.33
1.33
1.33
18-21
1.67
1.67
1.67
21-00
1.67
1.67
1.33
The greatest observed 3 hr Kp over the past 24 hours was 2 (below NOAA Scale levels). The greatest expected 3 hr Kp for Aug 23-Aug 25 2026 is 2.00 (below NOAA Scale levels).
No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast.
Solar Radiation Storms
Daily probability of an S-scale event
S1 or greater
Aug 23
25%
Aug 24
10%
Aug 25
10%
There is a chance for the greater than 10 MeV proton flux to reach S1 (Minor) levels on 23 Aug, and a slight chance on 24-25 Aug.
Radio Blackouts
Daily probability of an R-scale event
R1-R2
Aug 23
45%
Aug 24
45%
Aug 25
45%
R3 or greater
Aug 23
10%
Aug 24
10%
Aug 25
10%
There is a chance for R1-R2 (Minor-Moderate) radio blackouts, and a slight chance for an R3 (Strong) or greater event, over 23-25 Aug.
Source: NOAA SWPC — updated every 30 minutes