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Tropical DepressionOnce a group of thunderstorms has come together under the right atmospheric conditions for a long enough time, they may organize into a tropical depression.
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The storm begins as a tropical depression, as anticlockwise circulation begins to develop around a rainy, deepening low- pressure area. When the winds exceed 33 kt, the tropical depression is promoted to tropical storm and is given a name.
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When a storm develops a clearly recognizable pattern, it is referred to as a tropical depression. When wind speeds reach 35 knots (40.3 mph), it is called a tropical storm and is given a name.
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As the winds increase they move through the states of tropical depression and tropical storm before becoming a hurricane.
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special note are the occasions when tropical storms and/or hurricanes that did have names allotted, enter the area of interest. It is usual in these cases to allot the initial letter of the name to that depression, thus the extra- tropical depression ...
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The term is also sometimes used as a reference to a Tropical Depression. Depression StorageIn hydrologic terms, the volume of water contained in natural depressions in the land surface, such as puddles.
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See also: Storm, Depression, Pressure, Cyclone, Water
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