Tornadoes are most frequent in the Midwest and Great Plains due to the collision of warm and cold air masses.

The Midwest and Great Plains region, known as Tornado Alley, experiences the highest frequency of tornadoes in the U.S. because of the unique interaction between warm, moist air from the Gulf of Mexico and cold, dry air from the Rocky Mountains or Canada. When these air masses collide, it creates strong atmospheric instability, ideal conditions for severe thunderstorms and tornadoes. This region is particularly vulnerable to tornadoes during spring and early summer, when weather systems are most active. The combination of geography and climate makes the Midwest and Great Plains the most tornado-prone areas in the world.