Defined by the World Meteorological Organization: tropical cyclone with sustained winds reach 12 (ie 32.7 meters per second or above) is called a typhoon (or hurricane).
There are three conditions for the formation of typhoons:
1. The ocean temperature is above 25 (to ensure sufficient energy input)
2. Do not be too low latitude (to ensure adequate Coriolis parameter)
3. The vertical wind shear is not great
Satisfies the above three conditions on it. Western Pacific typhoon may have throughout the year. Just less winter and spring, summer and fall more just. This summer high water temperatures and low wind shear, strong convergence or divergence, the position of deputy high strength and scope of conditions conducive to good development is closely related to the typhoon.
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