Tornadoes occur most frequently in mid altitude areas that have access to low-level moist air and mid-level dry air.
Tornadoes are most common in the central United States' Great Plains, which provide an ideal environment for the formation of severe thunderstorms. Storms form in this area, known as Tornado Alley, when dry cold air moving south from Canada collides with warm moist air moving north from the Gulf of Mexico.
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