This is a photograph of a cumulonimbus cloud. Notice how the top of the cloud is shaped like an anvil.
Click on image for full size
Courtesy of UCAR Digital Image Library
Cumulonimbus clouds belong to the Clouds with Vertical Growth group. They are
generally known as thunderstorm clouds. A
cumulonimbus cloud can grow up to 10km high.
At this height, high winds will flatten the top of the cloud out into an
anvil-like shape. Cumulonimbus clouds are associated with heavy rain, snow, hail, lightning, and tornadoes.
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