Generally, Tornado Alley is a flat stretch of land from western Texas to North Dakota. Wikipedia describes it more accurately as “a colloquial term for the area of the United States where tornadoes are most frequent. The term was first used in 1952 as the title of a research project to study severe weather in parts of Texas and Oklahoma.


Although the boundaries of Tornado Alley are not clearly defined, its core is northern Texas, Oklahoma, Kansas, and Nebraska. Some research has indicated that tornadoes are becoming more frequent in the northern parts of Tornado Alley where it reaches the Canadian prairies.

There is also a secondary tornado alley in Ontario, Canada, which runs from the Great Lakes region to the upper St. Lawrence valley. It roughly follows the same route as Highway 401 from Windsor, Ontario to London, with a secondary path from Lake Huron to Barrie, Ontario and across to Ottawa, Ontario. After the U.S., Canada gets the most tornadoes in the world, and a third of those tornadoes strike Southwestern.

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