Tropical cyclones are divided into four levels according to the maximum wind speed near the center:
name
Attributes
Typhoon
The maximum wind speed appears >32.6 m/s, that is, more than 12 levels (64 knots or more)
Severe tropical storm
The maximum wind speed appears 24.5-32.6 m/s, that is wind 10-11 (48-63 nautical miles/hour)
Tropical storm
The maximum wind speed is 17.2-24.4 m/s, which is wind 8-9 (34-47 nautical miles/hour)
Tropical depression
The maximum wind speed is less than 17.2 meters/second, that is, wind power is 6-7 (22-33 knots/hour)
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