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Tropical cyclones with an organized system of clouds and thunderstorms with a defined circulation, and maximum sustained winds of 38 mph (61 km/h) or less are called "tropical depressions". Once the tropical cyclone reaches winds of at least 39 mph (63 km/h) they are typically called a "tropical storm" and assigned a name.
If maximum sustained winds reach 74 mph (119 km/h), the cyclone is called a hurricane in the North Atlantic Ocean. To discover more about hail, go to JetStream - an Online School for Weather.