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First, you need a special kind of thunderstorm called a supercell.

A supercell is a thunderstorm with a powerful, rotating updraft called a mesocyclone.

As the storm gets stronger a downdraft may descend from the back of the storm. This is called a rear-flank downdraft or RFD. The RFD wraps around the mesocyclone causing it to tighten, intensify, and extend towards the ground, becoming a tornado.

This is a somewhat simplified explanation. There are other factors that scientists still don't fully understand.

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14y ago

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