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The continental divide is an imaginary line that follows a continuous mountain ridge that divides a watershed into two drainage basins. In North America, the continental divide separates drainage between the Pacific and Atlantic oceans and extends from northwest Alaska into Central America. It has no effect on tornado rotation. Most tornadoes in the Northern Hemisphere rotate counterclockwise due to Earth's rotation. South of the equator, most twisters rotate clockwise, also with a few exceptions. [Source: Chicago Tribune]
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