:Product: 3-Day Forecast
:Issued: 2023 Jun 04 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 04-Jun 06 2023 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 04-Jun 06 2023

             Jun 04       Jun 05       Jun 06
00-03UT       3.67         3.33         2.67     
03-06UT       3.67         3.33         2.67     
06-09UT       3.33         3.00         2.33     
09-12UT       3.00         3.00         2.00     
12-15UT       2.33         2.00         1.67     
15-18UT       2.67         1.67         1.33     
18-21UT       2.00         2.00         1.33     
21-00UT       2.67         2.67         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-16 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 04-Jun 06 2023

              Jun 04  Jun 05  Jun 06
S1 or greater   10%     10%     10%

Rationale: There is a slight chance for S1 (Minor) or greater solar
radiation storms on Jun 04-06.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Jun 04-Jun 06 2023

              Jun 04        Jun 05        Jun 06
R1-R2           35%           30%           30%
R3 or greater   10%           10%           10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
with a slight chance for R3 or greater radio blackouts, on Jun 04-06,
from Regions 3319 and 3323.