How are typhoons classified?

Typhoons are divided into six grades: super typhoon, strong typhoon, typhoon, strong tropical storm, tropical storm and tropical depression.

Typhoon is a kind of tropical cyclone. Tropical cyclone is a low-pressure vortex that occurs on the surface of tropical or subtropical ocean, and it is a powerful and profound "tropical weather system".

In China, tropical cyclones in the northwest Pacific are classified into six grades according to the maximum average wind force near the center of the surface layer, and the wind force near the center reaches 12 or above, which is collectively called typhoon.