PRESTO ALERT

:Issued: 2024 May 16 1314 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 Coronal Mass Ejections (CME) seen in SOHO/LASCO images as launched at 15
May 08:27 UTC is believed to be two separate CME originating from NOAA
Active Regions (AR) 3670 and 3664. The first one is expected to arrive at
Earth's environment on the second half on 17 May. The second is expected to
deliver at most a glancing blow earlier the same day.
A CME that registered in SOHO/LASCO images as emitted at 14 May 18:36 UTC
is associated with the X8.7 flare of 14 May and is expected to deliver a
glancing blow during the second half of 17 May. Due to the expected arrival
of the CME of 15 May at approximately the same time, this glancing blow
might not be apparent.
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