Tropical Storm

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Weather

A tropical cyclone in which the maximum 1-minute sustained surface wind ranges from 34 to 63 knots (39 to 73 mph) inclusive.

NOAA National Weather Service — National Weather Service Glossary

Science› Weather

Hurricane Weather

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).

National Hurricane Center — Glossary of National Hurricane Center Terms retrieved 2014-05-26