This is a photo of mammatus clouds, taken in Weld County, Colorado.
Click on image for full size
Photo courtesy of Gregory Thompson

Mammatus

Mammatus clouds are pouches of clouds that hang underneath the base of a cloud. Usually mammatus clouds form with cumulonimbus clouds.

Mammatus clouds can look like a field of tennis balls or melons.

Last modified November 30, 2007 by Becca Hatheway.

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