Classification of tropical cyclones

2023年09月20日

Tropical cyclones above a particular wind speed are classified for public safety. 

Depending on the maximum sustained wind speed, tropical cyclones are designated as follows:

  • Tropical depression is when the maximum sustained wind speed is less than 63 km/h.
  • Tropical storm is when the maximum sustained wind speed is more than 63 km/h. It is then also given a name.
  • Hurricane, typhoon, tropical cyclone, very severe cyclonic storm - depending on the basin - when the maximum sustained wind speed exceeds 116 km/h or 63 knots.
A sample of a timetable for a project.

Further information:  

Guidelines for converting between various wind averaging periods in tropical cyclone conditions. 

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