Tropical DisturbanceA discrete tropical weather system of apparently organized convection--generally 100 to 300 mi in diameter--originating in the tropics or subtropics, ...
They significantly affect the atmospheric circulation throughout the global Tropics and subtropics, and also strongly affect the wintertime jet stream and atmospheric circulation features over the North Pacific and western North America.
TROPICAL AIR MASS An air mass that forms in the tropics or subtropics over the low latitudes. Maritime tropical air is produced over oceans and is warm and humid, while continental tropical air is formed over arid regions and is very hot and dry.
The Winter storms of June 1967 Occasionally the relative quiet of the Australian subtropics in winter is disturbed by an east coast low, with its gales and flood rains.
The NAM, or AO, is defined as the first EOF of northern hemisphere winter SLP data from the tropics and subtropics. It explains 23% of the average winter (December-March) variance, and it is dominated by the NAO structure in the Atlantic.
Central water is formed by subduction in the subtropics between 25° and 45° latitude in both hemispheres. It therefore spans a wide temperature and salinity range, with temperature and salinity both decreasing with depth.
**Tropical Continental (CT)**
Continental Tropical air forms over the subtropics arid areas and is very dry and hot. It has little importance in the United States. The only regions are in western Texas , eastern New Mexico and northcentral Mexico.
A discrete tropical weather system of apparently organized convection--generally 100 to 300 nmi in diameter -- originating in the tropics or subtropics, having a nonfrontal migratory character, and maintaining its identity for 24 hours or more.
Tropical air mass A warm-to-hot air mass that forms in the subtropics.
Tropical depression A mass of thunderstorms and clouds generally with a cyclonic wind circulation of between 20 and 34 knots ...
Tropical Disturbance: A discrete system of apparently organized convection originating in the tropics or subtropics, having a non-frontal migratory character and maintaining its identity for 24 hours or more.
They are either located in the tropics or subtropics. They characteristically have one or more closed isobars. They usually intensify slowly and may dissipate before reaching Tropical Storm intensity.
 See also: Tropics, Temperature, Water, Surface, Weather
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