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Hurricanes and tornadoes spin for different reasons. Hurricanes spin dues to the Coriolis effect, a consequence of the earth's spin. How it works is somewhat complicated, bu in essence the air flowing into a hurricane gets deflected, to the right if it is in the northern hemisphere and to the left in the Southern Hemisphere. This causes counterclockwise and clockwise rotation respectively.

Tornadoes, by contrast, are too small for the Coriolis effect to have a significant influence. Tornadoes get their rotation from the parent thunderstorm, which has a rotating updraft called a mesocyclone. Wind shear, a difference in wind speed and direction with altitude essentially twists the updraft, causing it to start rotating.

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