One section of the nation is best at producing tornadoes. Tornadoes are also relatively common in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Louisiana, Mississippi, Missouri, Nebraska, Oklahoma, South Dakota, and Texas.
Twisters are most common in spring and summer.
Nature creates its most powerful tornadoes by creating an atmospheric sandwich. This forms when moist, warm air gets trapped beneath a stable layer of cold, dry air. If a front or disturbances in the upper atmosphere move in, they help the warm, moist air break free. This air can rise and punch through the stable-air cap that was holding it down. The warm air will start to spiral upward, as latent heat is released when the moisture it holds condenses.