关于台风的介绍英语.pptxVIP

NATURAL DISASTERSTYPHOON What is typhoon?Typhoon is a kind of tropical cyclone. Tropical cyclones are low-pressure vortices over the tropical or subtropical ocean surface, and they are a strong and deep tropical weather system. The tropical cyclones in the South China Sea and the Northwest Pacific are divided into six grades according to the maximum average wind speed (wind speed) near the bottom center, and those with wind force of 12 or above are collectively referred to as typhoons. Grade of TyphoonIn the past, China used to call tropical cyclones formed on the tropical ocean surface above 26 ℃ as typhoons. According to their strength, they can be divided into six grades: tropical depressiontropical stormsevere tropical storm typhoonstrong typhoon super typhoon Factors and time of frequent typhoonsAccording to the statistics of the United States Navys Joint Typhoon Warning Center, the number of typhoons in the Northwest Pacific and the South China Sea from 1959 to 2004 is related to months, with an average of 26.5 typhoons per year. The month with the most typhoons is August of the Gregorian calendar, followed by July and September. Characteristics of Typhoon lt is characterized by strong and destructive force As the typhoon moves, it spins like a top. Its route is always zigzag, but almost every year it follows a relatively fixed route. Influence of TyphoonTyphoon not only harms human beings, but also protects human beings. Typhoon has brought fresh water resources to human beings, greatly alleviating the global water shortage. A typhoon with a small diameter can bring 3 billion tons of precipitation when it lands. In addition, the typhoon also makes the cold and hot around the world keep relatively balanced. The equatorial region has a hot climate. If the typhoon did not dissipate the heat, the tropics would be hotter, the cold belt would be colder, and the temperate zone would disappear from the earth. Methods of typhoon preventionPay close attention to th