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What is the difference between a typhoon, a hurricane and a tornado?
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A typhoon is a tropical cyclone that forms over the warm waters of the Pacific Ocean. It has sustained winds of at least 118 mph (190 km/h). Hurricanes form in the Atlantic Ocean and have sustained winds of at least 74 mph (119 km/h). Tornadoes are rotating columns of air that form over land and typically have wind speeds greater than 110 mph (177 km/h).