:Product: 3-Day Forecast
:Issued: 2026 Jun 06 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for Jun 06-Jun 08 2026 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown Jun 06-Jun 08 2026

             Jun 06       Jun 07       Jun 08
00-03UT       5.67 (G2)    2.67         2.33     
03-06UT       5.00 (G1)    2.67         2.67     
06-09UT       4.00         2.33         2.00     
09-12UT       3.00         2.33         2.00     
12-15UT       2.33         2.33         1.33     
15-18UT       2.67         2.33         1.67     
18-21UT       3.33         2.00         2.00     
21-00UT       3.67         2.33         2.33     

Rationale: G1-G2 (Minor-Moderate) geomagnetic storming is expected
during the early portions of 06 June due to lingering CME effects. Quiet
to unsettled conditions are expected on 07-08 June as any CME and weak
CH HSS effects gradually wane.

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 Jun 06-Jun 08 2026

              Jun 06  Jun 07  Jun 08
S1 or greater    5%      5%      5%

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 Jun 06-Jun 08 2026

              Jun 06        Jun 07        Jun 08
R1-R2           50%           50%           50%
R3 or greater   10%           10%           10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
and a slight chance for R3 (Strong) or greater events, over 06-08 Jun.