:Issued: 2023 Sep 21 0909 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 at 06:12 UTC
on 20 September by LASCO-C2. The CME originated in a region at the east limb, and the
bulk of the material was traveling to the east. The CME was slow (speed around 350
km/s), no effect is expected at the Earth.

A second (faint) partial halo CME with angular width around 180 degrees was first
seen at 14:12 UTC on 20 September by LASCO-C2. The CME was related to the M8.2 flare
from NOAA AR 3435, the bulk of the material was traveling to the south. The CME had a
speed around 800 km/s, an impact at the Earth can be expected on 23 September.
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