For a tropical storm to get a name, it has to have a minimum sustained wind speed. (judithcurry.com)
By «cyclone,» the authors include all Atlantic tropical storms (up through category 5 hurricanes) with maximum sustained wind speeds of at least 63 kph. (globalwarming.org)
A tropical revolving storm with sustained wind speeds of more than 118km / h (73mph). (metlink.org)