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A tropical depression or tropical low is a disturbance with a defined circulation, where the central position can be estimated, and the maximum 10-minute average wind speed is less than 34 kn (39 mph; 63 km/h) near the centre. [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]
This scale can be used to determine possible storm surge and damage impact on land. In most basins, the category of the tropical cyclone (for example, tropical depression, tropical storm, hurricane/typhoon, super typhoon, depression, deep depression, intense tropical cyclone) is determined from the cyclone's maximum sustained wind over one minute.
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 depression could form while the area is over the central tropical Atlantic through Monday. It is forecast to move toward the west at around 10 mph through the rest of the week.
The Saffir–Simpson hurricane wind scale (SSHWS) is a scale that 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.
Tropical Depression Six may get close enough to the northeastern islands of the Caribbean to bring an uptick in showers and thunderstorms by the middle of the week.