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This cloud form is known as mamma (the Latin word for "breast" or "udder") and is technically described as a "supplementary cloud form". It is created when downdraughts bring cold air from higher levels, causing the air to reach its dew point and condense into cloud droplets. Compensating warm air rises between the individual pouches of falling air.
Originally posted by DarthChrisious
These are clouds associated with strong thunderstorms. I took a weather & climate class last summer and the professor showed a picture of these clouds. He said if you ever see these clouds, run!