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What is the difference between a tropical depression, tropical storm and hurricane?

Jul 9, 2012  |    |  

Tropical cyclones are classified based on sustained wind speeds. Higher sustained winds are directly correlated to damage potential.

  • Tropical Depression: A tropical cyclone with maximum sustained winds of 38 mph (33 knots) or less.
  • Tropical Storm: A tropical cyclone with maximum sustained winds of 39 to 73 mph (34 to 63 knots).
  • Hurricane: A tropical cyclone with maximum sustained winds of 74 mph (64 knots) or higher. In the western North Pacific, hurricanes are called typhoons; similar storms in the Indian Ocean and South Pacific Ocean are called cyclones.
  • Major Hurricane: A tropical cyclone with maximum sustained winds of 111 mph (96 knots) or higher, corresponding to a Category 3, 4 or 5 on the Saffir-Simpson Hurricane Wind Scale.