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For systems below tropical cyclone strength there are various terms used, including Tropical Disturbance, Tropical Low and Tropical Depression. [28] 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. [ 28 ]
A tropical cyclone is the generic term for a warm-cored, non-frontal synoptic-scale low-pressure system over tropical or subtropical waters around the world. [4] [5] The systems generally have a well-defined center which is surrounded by deep atmospheric convection and a closed wind circulation at the surface. [4]
A tropical system in which the 10-minute maximum sustained winds are between 64–89 knots (74–102 mph; 119–165 km/h). [17] Tropical depression A tropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) is 33 kn (38 mph or 62 km/h) or less. [1] Tropical disturbance
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.
ORLANDO, Fla. — Tropical Depression Nineteen formed in the Caribbean early Thursday with the National Hurricane Center forecasting it to grow into Tropical Storm Sara. Long-term forecast models ...
A tropical wave could turn into a tropical depression by early next week, but its potential path and whether it would form further west in the Gulf of Mexico or near the Florida peninsula was ...
depression Any area of low atmospheric pressure at a given level in the atmosphere; i.e. a "low" or trough. The term is used especially frequently to refer to an early stage in the development of a tropical cyclone during which the disturbance is only weakly developed or poorly organized; see tropical depression. derecho
The latest on three systems in the Atlantic, including Tropical Depression 17.