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WATCH: Birth of incredible supercell thunderstorm

TORONTO – If you’ve ever wondered how massive, tornado-spawning thunderstorms are born, here’s a look from beginning to end.

The chasers, Basehunters Chasing, shot the time-lapse on May 18.

A supercell is a large, single-cell, severe storm which are capable of producing tornadoes, hail and damaging winds.

April to June is the period of most tornado activity in the United States. On average, the U.S. sees about 1,200 tornadoes annually.

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