Official Space Weather Advisory issued by NOAA Space Weather Prediction Center

Boulder, Colorado, USA



SPACE WEATHER ADVISORY OUTLOOK #26-33

2026 August 23 at 8:32 p.m. MDT (2026 August 24 0232 UTC)



**** SPACE WEATHER OUTLOOK ****



Summary For August 17-23


G1-Minor geomagnetic storms were observed on 18-19 Aug due to the flanking influence from a CME that left the Sun on 14 Aug, combined with the onset of a CIR ahead of a negative polarity CH HSS



R1-R2 (Minor-Moderate) radio blackouts were observed on 19-21 Aug following M-class activity from Regions 4507 and 4513. Region 4507 produced an M1.0 flare at 19/1824 UTC. Region 4513 produced an M1.8/Sf flare at 20/0805 UTC, an M8.1/Sf flare, and an M2.9/Sf flare at 20/1611 UTC.



No S1 or greater solar radiation storms were obsereved.



Outlook For August 24-30



No G1 or greater geomagnetic storms are expected during the outlook period.



There is a chance for M-class flares (R1/R2-Minor/Moderate) and a slight chance for X-class (R3-Strong) flares on 24-30 Aug, mainly attributed to the flare activity and magnetic complexity of Region 4513.



There is a slight chance for a greater than 10 MeV proton event on 24-30 Aug, mainly attributed to the magnetic complexity of Region 4513.



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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