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The storm that produces tornadoes (called a supercell) has a powerful, rotating updraft called a mesocyclone. The storm takes on this rotation when wind speed and/ or direction changes with altitude. This can start air rolling in what is called horizotnal vorticity. This horizontal rotation can then get turned vertical and become joined with a thunderstorms updraft to start it rotating on a vertical axis.
Tornadoes get their rotation from a rotating updraft called a mesocyclone. The tornado actually originates from the mesocyclone. The mesocyclone is part of a type of powerful thunderstorm called a supercell.

The supercell gets its rotation when the wind speed or direction changes with altitude. This starts air rolling horizontally. This horizontal rolling can then get turned vertical by a thunderstorm updraft, which in turn starts the updraft rotating.

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12y ago

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