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Mammatus formations are most often observed

  • A.hanging beneath the anvil of a cumulonimbus
  • B.at the base of a fair weather cumulus
  • C.within a uniform sheet of cirrostratus
  • D.along the top surface of a stratus deck

Answer: A

Correct answer: hanging beneath the anvil of a cumulonimbus

Mammatus are the pouches that hang from the underside of a cumulonimbus anvil, formed where cloudy air laden with ice sinks into the clearer air beneath and is cooled by evaporating as it descends. They indicate a vigorous storm, though they are a consequence of it rather than a threat in themselves - the severe weather is under the cloud, not under the mammatus.

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