:Issued: 2023 Sep 22 0758 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 partial halo CME with angular width around 150 degrees was first  seen by LASCO-C2
at 13:36 UTC on 21 September. The CME was related to the M8.7 flare from  NOAA AR
3435. The CME speed was estimated to be around 500 km/s, with the bulk of the
material directed to the south. Since the source is located close to disk center, an
impact at Earth can be expected on 25 September. 

A second wide CME was observed right after the first one, directed towards the NE,
this CME is backside and will not affect the Earth.
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