What are tornadoes and how do they form?

Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction.

Explanation:  Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction.

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A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud. Most tornadoes are formed from thunderstorms. You need warm and  moist air. Hope this helped!

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