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Tornado Alley: where tornadoes happen
Tornado Alley is an informal name for the part of the central United States, mainly the southern and central Great Plains, where strong tornadoes are common. It is not an official region, and tornadoes happen well outside it.
Why the Plains?
Tornado-producing storms need warm, moist air near the ground, cooler dry air above it, strong wind shear, and something to lift the air. The central United States is where those ingredients regularly meet: warm moist air flows north from the Gulf of Mexico, dry air arrives from the desert Southwest, and cold air moves in from Canada and the Rockies.
Where it is
Most definitions of Tornado Alley include Texas, Oklahoma and Kansas, and often Nebraska and parts of the Dakotas, Iowa and eastern Colorado. Different maps draw it differently because the boundary is a matter of convention, not meteorology.
Dixie Alley
Further east, a region across Mississippi, Alabama, Tennessee and neighbouring states is sometimes called Dixie Alley. Tornadoes there are often rain-wrapped, harder to see, and may occur at night or in cooler months, and the terrain is more heavily wooded. These factors make them especially dangerous.
When tornado season peaks
Tornadoes can happen in any month. Activity tends to peak in the southern Plains in late spring and to shift north through early summer, with a secondary season in the Southeast in autumn and winter. Local timing varies from year to year.
Sources
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Last reviewed 2 November 2026