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A tornado originates from a much larger but less intense circulation called a mesocyclone, located in the updraft area of a thunderstorm. Under the right conditions, a downdraft can wrap around a portion of the mesocyclone, causing it to become narrower. Since angular momentum must be conserved, as the rotation becomes narrower, it must also become faster. This leads to the relatively small but very intense circulation that we call a tornado.

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11y ago

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