500
FXXX10 KWNP 150031
DAYTDF

:Product: 3-Day Forecast
:Issued: 2026 Jun 15 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 15-Jun 17 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 15-Jun 17 2026

             Jun 15       Jun 16       Jun 17
00-03UT       2.67         2.67         2.00
03-06UT       3.00         3.67         2.67
06-09UT       2.67         3.67         3.00
09-12UT       1.67         2.67         2.67
12-15UT       1.67         1.67         2.00
15-18UT       1.00         1.67         2.33
18-21UT       1.67         1.67         1.67
21-00UT       1.67         2.00         2.67

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 15-Jun 17 2026

              Jun 15  Jun 16  Jun 17
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 Jun 15-Jun 17 2026

              Jun 15        Jun 16        Jun 17
R1-R2           15%           15%           15%
R3 or greater    1%            1%            1%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 15-17 Jun.