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39-73 mph (34 to 63 knots)
- A tropical cyclone that has maximum sustained surface winds (one-minute average) of 38 mph (33 knots) or less. Tropical Storm A tropical cyclone that has maximum sustained surface winds ranging from 39-73 mph (34 to 63 knots).
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A tropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) ranges from 34 kt (39 mph or 63 km/hr) to 63 kt (73 mph or 118 km/hr). Tropical Storm Warning:
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Oct 19, 2023 · 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:
The Saffir–Simpson hurricane wind scale (SSHWS) classifies hurricanes—which in the Western Hemisphere are tropical cyclones that exceed the intensities of tropical depressions and tropical storms—into five categories distinguished by the intensities of their sustained winds.
The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 rating based only on a hurricane's maximum sustained wind speed. This scale does not take into account other potentially deadly hazards such as storm surge, rainfall flooding, and tornadoes.
It is calculated by taking the squares of the estimated maximum sustained velocity of every active tropical storm (wind speed 35 knots or higher) at six-hour intervals. [30] The numbers are usually divided by 10,000 to make them more manageable.
May 1, 2020 · Tropical cyclones are classified by their maximum wind speed. Winds less than 39 mph: Tropical depressions. Winds 39-73 mph: Tropical storms. Winds 74 mph or greater: Hurricanes. Major hurricanes have winds of at least 111 mph and can reach speeds of over 180 mph, with gusts of 200 mph.
