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This photograph shows the build-up of cumulus clouds.
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Courtesy of Steve Albers

Types of Thunderstorms

There are two main types of thunderstorms: ordinary and severe. Ordinary thunderstorms are the common summer storm.

Ordinary thunderstorms last about one hour. Rain and small hail occur.

Severe thunderstorms are really dangerous. They can produce large hail, strong winds, intense rain, flash floods, and tornadoes. Severe thunderstorms can last several hours.



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