Can a tornado circulate counterclockwise in the Northern Hemisphere?
December 9, 2006 4:39pm CST
Most tornadoes circulate clockwise, but not all of them do. Scientists have documented a few going counterclockwise. Hurricanes, however, always circulate counterclockwise north of the equator and clockwise south of the equator, due to the Coriolis effect. This is why hurricanes don't occur at the equator. A move from the Northern to the Southern Hemisphere (or vice versa) would change the hurricane's direction and weaken it so much that it would fall apart.