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What causes a tornado to reach the ground?
Question Date: 2011-05-02
Answer 1:

Tornados are the spinning cores of thunderstorms caused by a combination of the Coreolis effect and the physical property of the conservation of angular momentum. If the spinning core develops, it will reach out of the thundercloud and extend to the ground, just as the wind coming into a thunderstorm swirls. The funnel is just a manifestation of the condensation of water droplets getting low enough to reach the ground - the winds are there beforehand.

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