<human>:  What is the difference between a hurricane and a tornado?
<bot>: A hurricane is a tropical cyclone that has sustained winds of greater than 74 mph, which is classified as a Category 1 storm. A tornado is a rapidly rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. Tornadoes have the appearance of a funnel cloud and most commonly occur in the Midwest region of the United States known as Tornado Alley. Hurricanes typically move much slower than tornadoes, form over large bodies of water, and can cause more widespread damage than a tornado.