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Chasing Tornadoes Map
Mighty Winds (For easy viewing, dowload map)

Deadly brushstrokes of tornado paths underscore the fact that the United States suffers more tornadoes than any other nation. A thousand or so touch down in the continental U.S. each year as warm, moist air from the Gulf of Mexico clashes with cool, dry air flowing eastward off the Rocky Mountains. The storms, which typically move from southwest to northeast, claimed 55 lives in 2002. But tornadoes are a global menace. Wherever warm, humid winds blow over continental land masses, twisters are possible.

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