tropical depression

English

Noun

tropical depression (plural tropical depressions)

  2. (meteorology) An organized low-pressure system of thunderclouds with closed surface circulation and maximum sustained winds of less than 34 knots (63 km) per hour.
    Coordinate terms: (all stronger) tropical storm; hurricane, typhoon, cyclone (narrow sense), tropical cyclone; cyclone (broad sense), storm
    Janice was a tropical depression 10 days ago, a tropical storm 5 days ago, and a hurricane yesterday and today.

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