When will the typhoon come?

Typhoons generally appear in May-65438+February, with the largest number in July-September.

Generally speaking, no typhoon landed in China from June 5438 to April, and the south bank of Hangzhou Bay in China may be affected by typhoon. The most common route is to move westward between 10 and 15 north latitude, and then turn to Japan via the waters near Ryukyu Islands. The other enters the northern part of the South China Sea westward. From July to August, China's coastal areas are more likely to be affected by typhoons, mainly moving westward between north latitude 15 ~ 25, affecting China.

The area affected by typhoon ~ 10 in September in China is mainly south of the Yangtze River estuary. The most common path is to move westward between north latitude 15 and 20, and then turn northeast to affect Japan. The other path intermittently moves westward into the South China Sea, affecting Vietnam and Guangdong Province. In September, between these two paths, there was another path that affected Taiwan Province and Fujian provinces.

From June 65438+ 10 to February 65438+February, only the area west of the Pearl River Estuary in Guangdong Province was occasionally affected by typhoons. To sum up, the coastal areas of South China are hit by typhoons with the highest frequency, accounting for 60.4% of the annual total, and the landing frequency is as high as 58. 1%. It is the second coastal area in East China, accounting for about 37.5%. Typhoons mainly land in May ~ 65438+February, with the largest number in July ~ September, accounting for 76.4% of the annual total, which is the high-frequency season for typhoons to invade China.

Typhoon structure:

Typhoon is a deep low-pressure system, and its central air pressure is very low. There is an air flow converging towards the center at the lower level, and the air flow at the upper level mainly diverges outward. If the typhoon is cut horizontally, we can see that there are three obviously different areas, from the center to the outside: typhoon eye area, cloud wall area and spiral rain belt area.

Typhoon Eye Area: It's strange that the wind here is very light and the weather is sunny, with an average diameter of 40 kilometers. The sailors who participated in it humorously called Typhoon Eye "Xanadu". Cloud wall area: the cloud wall area with a width of tens of kilometers and a height of more than ten kilometers around the typhoon eye, also called eye wall. The cloud wall is towering here, the wind is howling, the rain is pouring, the sea is churning, and the weather is the worst.