Wilma van Heusden

Wilma van Heusden

Wilma van Heusden
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Augustine ash cloud by Thren09, via Flickr

MAMMATUS clouds are most often associated with the anvil cloud & severe thunderstorms. They often extend from the base of a cumulonimbus but may also be found under altocumulus, altostratus, stratocumulus, & cirrus clouds as well as volcanic ash clouds^