In an attempt to codify cloud vocabulary and aid
in weather prediction, the World Meteorological
Association (WMO) published the first International
Cloud Atlas in 1896. The Atlas divides clouds into 10
genus, 26 species, and 31 varieties, and includes important tips for cloud
identification as well as appropriately whimsical descriptions — cloud
species range from praecipitatio, "to fall (down a
precipice)" to castellanus, "a castle of a fortified town."
Though many updates and new editions have been published since, no new cloud
types have been added to the Atlas since cirrus intortus ("an
entangled lock of hair") was added in 1951.
Until now.
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