PRESTO ALERT

:Issued: 2024 May 20 0844 UTC
:Product: documentation at http://www.sidc.be/products/presto
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# FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium)         #
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A full halo CME was first seen at 05:36 UT on LASCO C2, originating from an
eruption close to NOAA AR 3683 (located at the southwest, at S25W60),
associated with a C6.7 flare. The CME is fast, early speed estimates are
around 1500 km/s, but more images are needed for a better estimation. The
bulk of the CME is directed to the southwest, but a glancing blow can be
expected on 22 May. Due to the location of the event and the speed of the
CME, a proton event may occur in the coming hours.
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