Science
Tornadoes

Why does a tornado descend from the base of a cloud?

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Wiki User
10/07/2014

The process of tornado formation usually starts about three miles above the ground, within a thunderstorm. A larger, less intense circulation, called a mesocyclone, tightens and stretches, extending toward the ground. The funnel itself is a result of moist air being drawn into the vortex. The low pressure inside the vortex causes temperature to drop, which in turn causes condensation.