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For systems below tropical cyclone strength there are various terms used, including Tropical Disturbance, Tropical Low and Tropical Depression. [26] A tropical disturbance is defined as being a non-frontal system of synoptic scale originating over the tropics, with persistent enhanced convection or some indication of a circulation. [ 26 ]
A tropical cyclone is a rapidly rotating storm system with a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its location and strength, a tropical cyclone is called a hurricane ( / ˈhʌrɪkən, - keɪn / ), typhoon ...
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. This measuring system was formerly known as the Saffir ...
A tropical cyclone is a "warm-core non-frontal synoptic-scale cyclone" that originates over tropical or subtropical waters, according to the NHC. They have organized deep convection and a closed ...
Tropical depression: A tropical wave that has begun to organize, and has started “to spin.” A tropical depression has winds less than 39 mph, whereas a hurricane has winds of 74 mph or higher.
The maximum sustained wind associated with a tropical cyclone is a common indicator of the intensity of the storm. Within a mature tropical cyclone, it is found within the eyewall at a distance defined as the radius of maximum wind, or RMW. Unlike gusts, the value of these winds are determined via their sampling and averaging the sampled ...
Tropical Depression Ten was a short-lived tropical cyclone that made landfall on the Florida Panhandle in September 2007. The system developed as a subtropical depression on September 21 in the northeastern Gulf of Mexico from the interaction of a tropical wave , the tail end of a cold front , and an upper-level low .
A tropical depression is a tropical cyclone that reaches maximum sustained winds below 34 knots (39 mph; 63 km/h). The Japan Meteorological Agency (JMA) is the main weather forecasting agency in the Pacific Northwest Pacific basin, where it measures sustained winds by averaging wind speeds in a period of ten minutes.