Official Space Weather Advisory issued by NOAA Space Weather Prediction Center

Boulder, Colorado, USA



SPACE WEATHER ADVISORY OUTLOOK #25-14

2025 April 20 at 7:31 p.m. MDT (2025 April 21 0131 UTC)



**** SPACE WEATHER OUTLOOK ****



Summary For April 14-20


-G1 (Minor) storms were observed on 15-16 Apr due to CME influences, and on 20 Apr due to prolonged periods of southward IMF. 

-G2 (Moderate) storms were observed on 15-16 Apr due to CME influences.

-G3 (Strong) storms were observed on 16 Apr due to CME influences.

-G4 (Severe) storms were observed on 16 Apr due to CME influences.



-R1 (Minor) events were observed on 14-15, 18, and 20 Apr.



Outlook For April 21-27



-Periods of G1 (Minor) storming are likely on 22-25 Apr due to positive polarity CH HSS influences.

-Periods of G2 (Moderate) storming are likely on 22-23 Apr due to positive polarity CH HSS influences.



No other space weather storms are expected during the forecast period. 



Data used to provide space weather services are contributed by NOAA,

USAF, NASA, NSF, USGS, the International Space Environment Services 

and other observatories, universities, and institutions. More 

information is available at SWPC's Web site http://swpc.noaa.gov

---

Thank you for using the Product Subscription Service. If you would like to remove a product subscription or update the personal information in your account, go to the Product Subscription Site. Please do not use the from address for correspondence, as it is not monitored. For comments or help, please contact SWPC Help.