CUMULONIMBUS MAMMATUS A portion of a cumulonimbus cloud that appears as a pouch or udder on the under surface of the cloud. Although they do not cause severe weather, they often accompany storms.
Cumulonimbus Mammatus Cloud (CBMAM) It is associated with a cumulonimbus cloud. It indicates extreme instability. This cloud is characterized by hanging festoons or protuberances underneath the anvil of the Cumulonimbus Cloud (Cb).
MAMMATOCUMULUS An obsolete term for cumulonimbus mammatus, it is a portion of a cumulonimbus cloud that appears as a pouch or udder on the under surface of the cloud. Although they do not cause severe weather, they often accompany storms.
 See also: Meteor, Clouds, Ice Crystals, Storm, Atmospheric pressure
  
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