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
also known as thunderstorm clouds. A
cumulonimbus cloud can grow up to 10km high.
At this height, high winds make the top of the cloud flat. Cumulonimbus clouds can produce heavy rain, snow, hail, lightning, and tornadoes.
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