The U.S. National Hurricane Center issues advisories for tropical storms and hurricanes in the Atlantic basin.
October 07, 2025
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Operational role of the National Hurricane Center in tracking and communicating tropical cyclone information
The National Hurricane Center issues a tropical storm watch for a specific area when tropical storm conditions are possible there, typically within 48 hours of the watch being issued.
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Operational definition of a tropical storm watch used in forecasting and public advisories.
A tropical cyclone is classified as a hurricane when its maximum sustained winds reach approximately 75 miles per hour.
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Wind-speed threshold distinguishing hurricanes from tropical storms.