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What are Cumulonimbus clouds?

Published On: Jul 22 2011 03:12:55 PM EDT

Cumulonimbus clouds are also known as thunderstorm clouds.

High winds, usually from the jet stream, can flatten the top of the cloud into an anvil-like shape.

The anvil usually points in the direction the storm is moving.

These clouds are associated with heavy rain, hail, lightning and even tornadoes.

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