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A thunderstorm does not become a tornado, it produces them. How exactly thunderstorm produce tornadoes, but this is the best theory so far.

First you need a special kind of thunderstorm called a supercell. This is a powerful, rotating thunderstorm. The rotation is especially strong at an updraft called a mesocyclone. If the strong strengthens fast enough a special kind of downdraft may descend from the back of the storm and wrap around the bottom part of the mesocyclone. This forces it to become smaller and can bring it down to the ground. As the rotation gets smaller it speeds up, producing a tornado.

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14y ago

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