Wall cloud
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Wallcloudwithtailcloud.jpg
Wallcloudwithtailcloud.jpg
Wall cloud with tail cloud
A wall cloud is a cloud formation. It is the area of rotating (and often rain-free) cloud that extends below the cloudbase of a supercell thunderstorm, and indicates the area of maximum updraft. It is the area which can produce tornadoes.
They can extend from a being a fraction of a mile wide to over five miles across, and typically form at the south or southwest end of a supercell mesocyclone.