What are the characteristics of typhoon weather?

A typhoon is a huge air vortex. Its diameter ranges from a few hundred kilometers to more than a thousand kilometers, and its height is generally more than 9 kilometers, and some even extend to 27 kilometers. There is a hollow tubular area with a diameter of about 10 km in the center of the typhoon, which is called "typhoon eye area" in meteorology. Downward flow is popular in typhoon eyes, mostly sunny and sunny. Judging from the eye of the typhoon, there are huge and thick cloud walls all around, which is the worst place for the storm.

When the typhoon moves, it rotates like a top. The route it takes is always winding, but it follows a relatively fixed route almost every year. The typhoons that affect China are mainly the Pacific Northwest Typhoon and the South China Sea Typhoon. Its activity path changes with the seasons: 1 to April, most typhoons only move south of north latitude 10 degrees, which has no influence on China. There are two main paths from May to June: one is from east to west between north latitude 10- 15 degrees, and it enters the South China Sea; The other turned between 120 ~ 125 degrees east longitude and moved to Japan in the northeast. July to September is the peak of typhoon activity in the northwest Pacific. After the typhoon was generated, it moved from east to west along the north latitude 10 ~ 25 degrees, affecting the southeast coast of China and sometimes even invading North China and Northeast China. Some typhoons failed to continue westward and turned northeast at sea. During the period from 10 to 12, the typhoon moved southward, mainly moving from east to west south of 17 degrees north latitude, affecting the South China Sea. Part of it moves northeast from the East China Sea in Taiwan Province Province.

Typhoon wind speed is very high, the maximum wind speed is generally 40 ~ 60m per second, and the maximum wind speed of some strong typhoons can reach 1 10m per second. During a typhoon, the rainfall usually reaches 200 ~ 300mm, and sometimes even reaches 1000mm. So the places where typhoons pass often cause floods.

From 65438+65438+/kloc-0 in 0989 to 1 in October, China began to use the internationally prescribed tropical cyclone names and classification standards. That is, when the center position of tropical cyclone cannot be accurately determined and the average maximum wind force is less than 8, it is called low pressure; The center position of tropical cyclone can be determined, but the average maximum wind force near the center is less than 8, which is called tropical depression; When it reaches 8-9, it is called a tropical storm; When it reaches 10- 1 1, it is called a strong belt storm; When it reaches more than 12, it is called a typhoon.