Some tornadoes may form during the early stages of rapidly developing thunderstorms. This type or tornado is most common along the front range of the Rocky Mountains, the Plains, and the Western State. Tornadoes may appear nearly transparent until dust and debris are picked up. Occasionally, two or more tornadoes may occur at the same time.
Waterspouts are weak tornadoes that form over warm water.
Waterspouts are most common along the Gulf Coast and southeastern states. Waterspouts occasionally move inland, becoming tornadoes causing damage and injuries. November 22, 2000.