The Tropical storm reference article from the English Wikipedia on 24-Apr-2004
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Tropical storm

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Tropical storms are exceptionally severe, much worse than a standard thunderstorm. They can cause great damage to property and loss of life, so it is fortunate that they are rare.

Tropical storms can only form in certain parts of the world and under certain climatic conditions. They are classified according to severity - a tropical storm is not as bad as a hurricane, but worse than a tropical depression.

Tropical cyclones are classified into three main groups - tropical depressions, tropical storms, and tropical cyclones/tyhoons/hurricanes (the name of this group varies according to region).

See also:
Tropical Storm is also the title of a novel by Melissa Good, currently being developed into a movie by Ladyhawke Productions.