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  NOAA 3 Day Space Weather Forecast
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The greatest observed 3 hr Kp over the past 24 hours was 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Apr 15-Apr 17 2021 is 5 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 15-Apr 17 2021

            Apr 15     Apr 16     Apr 17
00-03UT        3          2          5 (G1)
03-06UT        3          1          4     
06-09UT        5 (G1)     3          4     
09-12UT        1          3          3     
12-15UT        4          3          3     
15-18UT        2          4          2     
18-21UT        2          4          3     
21-00UT        2          4          3     

Rationale: G1 (Minor) geomagnetic storm levels occurred on 15 Apr due to
CME effects. G1 (Minor) geomagnetic storm levels are likely on 17 Apr
due to CH HSS effects.

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 Apr 15-Apr 17 2021

              Apr 15  Apr 16  Apr 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 Apr 15-Apr 17 2021

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

Rationale: No R1 (Minor) or greater radio blackouts are expected.  No
significant active region flare activity is forecast.