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Originally posted by Phage
reply to post by AeonStorm
Small clarification.
Asperatus are not a "new" cloud. Their classification as a separate cloud type is new.
Source
As of June 2009 the Royal Meteorological Society is gathering evidence of the type of weather patterns in which undulatus asperatus clouds appear, so as to study how they form and decide whether they are distinct from other undulatus clouds.