Rotating Wall Cloud
by Science Source
Title
Rotating Wall Cloud
Artist
Science Source
Medium
Photograph - Photograph
Description
Circular base of a rotating wall cloud. Oklahoma May 30, 1976. A wall cloud (or pedestal cloud) is a large, lowering, and rotating base of a cumulonimbus cloud that potentially forms tornadoes. It is typically beneath the rain-free base (RFB) portion of a deep cumulus cloud (normally cumulonimbus but on rare occasion cumulus congestus), and indicates the area of primary and strongest updraft which condenses into cloud at altitudes lower than that of the ambient cloud base. Most strong tornadoes form from wall clouds.
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March 13th, 2013
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