- Pouches of Mammatus, each a bubble of air with negative buoyancy
- W001797Z
- Pouches of Mammatus cloud glow pink in a dreamy sunset sky. Each pouch is a bubble of air filled with particles of ice or rain sinking under negative buoyancy. As these evaporate, the cooling air enhances the downdraft. The bottom edge of each pouch becomes blurred and soft as particles lose mass and shrink before evaporating or sublimating completely.
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