128
FXXX10 KWNP 021231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Jun 02 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 Jun 02-Jun 04 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 02-Jun 04 2026

             Jun 02       Jun 03       Jun 04
00-03UT       2.33         1.67         3.00
03-06UT       1.67         3.00         2.67
06-09UT       1.67         2.67         2.67
09-12UT       1.33         1.67         3.00
12-15UT       1.33         2.33         2.67
15-18UT       1.33         2.67         3.00
18-21UT       1.67         3.67         2.67
21-00UT       2.67         3.00         3.67

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-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 02-Jun 04 2026

              Jun 02  Jun 03  Jun 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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Jun 02 2026 1005 UTC.

Radio Blackout Forecast for Jun 02-Jun 04 2026

              Jun 02        Jun 03        Jun 04
R1-R2           20%           20%           20%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 04 Jun.