Raymarine E120W, Reference Manual

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264 E-Series Networded Display Reference Manual
Tropical cyclone A low pressure system that generally forms in the tropics. The
cyclone is accompanied by thunderstorms and, in the Northern
Hemisphere, a counterclockwise circulation of winds near the
earth's surface.
Tropical depression An organized system of clouds and thunderstorms with a defined
surface circulation and maximum sustained winds of 38 mph (33 kt)
or less.
Tropical storm An organized system of strong thunderstorms with a defined sur-
face circulation and maximum sustained winds of 39-73 mph (34-
63 kt).
Tropics An area on the Earth's surface that lies between 30º north and 30º
south of the equator.
Trough An elongated area of relatively low atmospheric pressure, usually
extending from the centre of a low pressure region.
Typhoon The name for a tropical storm originating in the Pacific Ocean, usu-
ally the China Sea. They are basically the same as the hurricanes of
the Atlantic Ocean and the cyclones of the Bay of Bengal.
Wave cyclone A storm or low-pressure centre that moves along a front.
Term Definition