Wanderlust World Wanderlust World The most destructive tornadoes in the United States are concentrated in Tornado Alley, a loosely defined area in the central Great Plains.
The clash of warm, moist air from the Gulf of Mexico with cool, dry air from the Rockies creates extreme atmospheric instability. This, combined with strong wind shear, fuels supercell thunderstorms that produce violent tornadoes.
Dixie Alley (Southeast U.S.) also experiences deadly tornadoes, often at night and in more populated areas. However, the highest frequency of intense (EF4/EF5) tornadoes remains in the traditional Tornado Alley.