An organized group of thunderstorms often found over a tropical ocean that generates a cyclonic flow of between 64 and 118 kilometers per hour. Often develops into a hurricane.

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

Organized thunderstorms with a cyclonic wind circulation between 35 and 64 knots.

weather pattern of swirling winds over a center of low pressure above warm ocean waters. Tropical storms are less powerful than cyclones and hurricanes.

Term used in the northern hemisphere for a tropical cyclone.

A tropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) ranges from 63 km/h (39 mph) to 118 km/h (73 mph). Source: NOAA-NHC.

An organized low pressure system in the tropics with wind speeds between 38 and 74 miles per hour. In Australia, it is a term used in the northern hemisphere for a tropical cyclone.

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).

A tropical cyclone in which the maximum sustained surface winds are from 39 miles per hour (34 knots) to 73 miles per hour (63 knots). At this point, the system is given a name to identify and track i [..]

A tropical Cyclone in which the maximum sustained surface Wind speed ranges from 34 kt (39 mph or 63 km/hr) to 63 kt (73 mph or 118 km/hr).

A tropical depression with winds of 39-73 miles per hour.

Tropical storms generally form in the eastern portion of tropical oceans and track westward. Hurricanes, typhoons, and willy-willies all start out as weak low pressure areas that form over warm tropic [..]

It is a warm-core tropical cyclone that has maximum sustained surface wind speed (using the U.S. 1-minute average) ranges from 34 kt (39 mph / 63 km/h) to 63 kt (73 mph / 118 km/h).  .

See tropical cyclone.

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

A tropical cyclone with maximum winds less than 34 m/sec (75 mile per hour). Compare with hurricane or typhoon (winds greater than 34m/sec).

Term used in the northern hemisphere for a tropical cyclone.

Cyclone. An area of low pressure with inward spiraling winds less than 74 miles per hour and ascending air at the center. May become a Hurricane.

A tropical cyclone in which the 1-minute sustained surface wind ranges 39-73 mph. Tropical storms pose a threat to life and/or property in coastal areas.

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).

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

A tropical cyclone having wind speeds of 63 to 118 km (39 to 73 mi) per hour; a storm at pre-hurricane stage.

A tropical cyclone in which the maximum sustained surface winds are from 39 miles per hour (34 knots) to 73 miles per hour (63 knots). At this point, the system is given a name to identify and track it.

A tropical cyclone in which the maximum sustained surface winds are from 39 miles per hour (34 knots) to 73 miles per hour (63 knots). At this point, the system is given a name to identify and track i [..]

A tropical cyclone

A tropical cyclone in which the maximum sustained surface wind speed ranges from 39 to 73 mph.

Organized thunderstorms with cyclonic wind speed between 35-64 knots.

An organized cyclone in the tropics with wind speed between 35 and 64 knots

A tropical cyclone with 39 to 74 mph winds.

A tropical cyclone in which the maximum sustained surface winds are from 39 miles per hour (34 knots) to 73 miles per hour (63 knots). At this point, the system is given a name to identify and track it.

A cyclone within the tropics, typically having its thunderclouds organized in a spiral shape with wind speeds on the surface between about 30 and 75 miles (60 - 120 km) per hour.

 An area of extreme low pressure characterised by high velocity rotational winds and heavy rainfall.