Tropical Cyclone
A tropical cyclone is a rotating low-pressure weather system that has organized thunderstorms but no fronts (a boundary separating two air masses of different densities). Tropical cyclones with maximum sustained surface winds of less than 39 miles per hour (mph) are called tropical depressions. Those with maximum sustained winds of 39 mph or higher are called tropical storms. When a storm's maximum sustained winds reach 74 mph, it is called a hurricane. In the Atlantic and eastern Pacific Oceans, the term hurricane is used. The same type of disturbance in the western Pacific is called a typhoon and in the Indian Ocean and South Pacific Ocean, it is called a cyclone.
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