Reproduced from
https://www.bbc.co.uk/news/59641376
How are tornadoes formed?
When warm moist air is trapped by cooler air, it causes thunder clouds to form.
The warm air rises, creating an updraft.
And if there are also strong winds moving in different directions, the air column starts to rotate.
Increasing amounts of warm air are drawn in, speeding up the wind spiral, which then extends out of the bottom of the thunder clouds.
And once this touches the ground, it is a tornado.
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