1、,Group 6,Typhoon,1. Definitions of typhoon. 2. Causes of typhoon. 3. The disadvantages of typhoon. 4. The advantages of typhoon. 5. Methods of prevention of typhoon.,Five parts,1.Typhoon is a name used in east Asia for a Hurricane. 2.Typhoon is a type of cyclone occurring in the western regions of t
2、he Pacific Ocean. 3.A typhoon is similar to a hurricane in levels of destructiveness. 4.The word typhoon comes from the Chinese term tai-fung meaning great wind.,Part one : definitions of typhoon,5.The typhoon center is called the eye of typhoon .The diameter range from 10km to 70km,45km on average.
3、 The wind speed and air pressure in the eye of typhoon both are the lowest,and the weather appear to be windless,partly cloudy,warm and dry.,6.The level of typhoon,TY：The average wind speed in the center of bottom ranges from 32.7m/s to 41.4m/s，the level 12-13. STY(severe typhoon)：The average wind s
4、peed in the center of bottom ranges from 41.5m/s to 50.9m/s，the level 14-15. Super TY：The average wind speed in the center of bottom is higher than 51.0m/s, the level 16 or higher.(Rammasun 17),Now I will tell you how typhoon come into being. Mostly in summer and autumn there exists typhoon. In broa
5、d sea surface ,when temperature rises above 26 degrees , the vapor would go up cause the air near sea surface is lighter than the air above .when the air goes up it will be turned into liquid for the higher, the colder , releasing more heat ,which helps the lower air goes up .And it continues and cy
6、cles. And the liquid is heavier than air, so the air dropped down and there is a rainfall . Because of the coriolis force it becomes rolling around and around .Then typhoon is there.When typhoon arrives at lands ,trees and buildings will cut down its force ,making lessdamage and loss .,Part two: Cau
7、ses of Typhoon,Part three : disadvantages of typhoon,1. Typhoon may destroy the crops. 2. Typhoon is one of the weather systems that brings heavy rain. in the typhoon area, may produce heavy rain.,3. The weather often brings about a dangerous situation caused by typhoon,the sea waves, a serious thre
8、at to the safety of navigation.After the landing of typhoon storm surge , the water can destroy crops,all kinds of buildings, resulting in heavy losses of life and property of the people.,Part four : the advantages of typhoon,1.Typhoon brings abundant freshwater.2.Typhoon causes tropical cooling. If
9、 there is no typhoon, tropical will be more hot, boreal will be more cold,and temperate zone will disappear.,3. Typhoon can increase fish production .4.Typhoon makes people live and work in peace.,At sea: 1. Before the typhoon ,you should immediately find a place for you to take shelter from the win
10、d. 2.If you are caught in a typhoon , you should timely ask the relevant departments for help. 3. When you are waiting for rescue , you should take emergency measuresquickly away from typhoon.,Part five: Methods of prevention of typhoon.,At home: 1.Close the door and window. 2. Move from the old hou
11、se to a safe place. 3. Bring your outdoor things in.,On outside: 1. If you are outside, look for tall buildings to escape, so as not to be blown away by powerful typhoon.2. Do not stand in dangerous places, such as:thin objects.,References,1.台风.百度百科.（http:/ 2.热带气旋.百度百科.（http:/ 3.热带气旋等级划分.中国天气网.(http:/ 4.Typhoon.Wikipedia.(https:/en.wikipedia.org/wiki/Typhoon),Thank You,
