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Tornado Alley Map

Map Showing Tornado Risk Areas in the Conterminous United States, also known as 'Tornado Alley'.

The categories shown reflect the tornado recurrence interval at a single point. In the highest risk areas, a tornado of significant strength would be expected to occur once every 2000 years, at each point in the area shown. For the high-risk areas, the interval would be once every 5000 years. The data base is 800 cases of significant tornadoes for the period 1954-1992.

Source: U.S. Geological Survey



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