wall cloud

wall cloud

A wall cloud (or pedestal cloud) is a large, localized and persistent lowering cloud formation that develops beneath the base of a cumulonimbus cloud that often forms tornadoes. It is typically beneath the rain-free base (RFB) portion of a thunderstorm, and indicates the area of the strongest updraft within a storm. Rotating wall clouds are an indication of a mesocyclone in a thunderstorm; most strong tornadoes form from these. Wall clouds do not always rotate, however.

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Part of Speech: noun
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Blossary: Clouds
Industry/Domain: Weather
Category: Clouds
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