Is there a typhoon in Zhejiang?

Zhejiang Province, located in the southeast coast of China, is vulnerable to typhoons every summer and autumn, and it is the fifth province with the largest number of typhoons landing in China. China Weather Network analyzed the big data of typhoons that landed in Zhejiang during 1949-202 1, and found that the main period affected by typhoons in Zhejiang was 7- 10, and most of the landing typhoons were "ruthless", and three of them were super typhoons.

Causes of typhoon formation:

The formation of typhoon requires the following conditions: the sea surface water temperature is above 26.5℃; Initial disturbance of a positive vorticity; The shear of ambient wind in the vertical direction is very small; Low pressure or cloud disturbance is at least several latitudes from the equator. Because people don't fully understand the formation of typhoons now, the above list is only a necessary condition for the formation of typhoons.

The initial stage of typhoon is tropical depression, and it usually takes about 2 days from the initial low-pressure circulation to the maximum average wind force near the center, only three or four days for the slow one and only a few hours for the fast one. In the development stage, the typhoon continuously absorbs energy until the central air pressure reaches the lowest value and the wind speed reaches the maximum value.

After the typhoon landed, under the joint influence of ground friction and insufficient energy supply, it will quickly weaken the death.