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Old 2nd Jan 2019, 14:58
  #1656 (permalink)  
cowl flaps
Join Date: Mar 2007
Location: Cairns FNQ
Age: 66
Posts: 145
Mammatus clouds are pouch-like cloud structures. They're also a rare example of clouds in sinking air-- most clouds form in rising air. Although mammatus most frequently form on the underside of a cumulonimbus, they can develop underneath cirrocumulus, altostratus, altocumulus and stratocumulus.
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