Tornado Alley
It has also been asserted that there are numerous Tornado Alleys. In addition to the Texas/Oklahoma/Kansas core, such areas include the Upper Midwest, the lower Ohio Valley, the Tennessee Valley and the lower Mississippi valley. Some studies suggest that there are also smaller tornado alleys located across the United States.
Canada Tornado Alley
Technically speaking, no province or territory is entirely free of tornadoes; however, they occur more frequently in the Central Canada and Southern Canada, between the Rocky Mountains and the Great Lakes and between the Great Lakes and the St. Lawrence River.