Final answer:
Tornadoes in the United States are most likely to develop during the months of March, April, May, and June in tornado alley, which is the central United States. They form when there is a difference in wind speeds between the cold winds higher up in the atmosphere and the weaker winds traveling north from the Gulf of Mexico.
Step-by-step explanation:
Tornadoes in the United States are most likely to develop during the months of March, April, May, and June. These months make up the peak tornado season in the central United States, which is also known as tornado alley. Tornadoes form when there is a difference in wind speeds between the cold winds higher up in the atmosphere and the weaker winds traveling north from the Gulf of Mexico. This creates a column of rotating air that can shift and produce tornadoes.