Official Space Weather Advisory issued by NOAA Space Weather Prediction Center

Boulder, Colorado, USA



SPACE WEATHER ADVISORY OUTLOOK #25-16

2025 May 18 at 8:21 p.m. MDT (2025 May 19 0221 UTC)



**** SPACE WEATHER OUTLOOK ****



Summary For May 12-18


R3 (Strong) radio blackouts were observed on 13 May due to activity from Region 4086.



R1-R3 (Minor-Strong) radio blackouts were observed on 14 May due to activity from Region 4087.



R1 (Minor) radio blackouts were observed on 15 May due to activity from Region 4087



G2 (Moderate) geomagnetic storms were observed on 17 May in response to coronal hole influence.



G1 (Minor) geomagnetic storms were observed on 18 May in response to coronal hole influence.



No other space weather storms were observed during the summary period.



Outlook For May 19-25



G1 (Minor) geomagnetic activity is likely on 19 May due to continued coronal hole influence.



No other space weather storms are expected during the outlook 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

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