A hurricane is a tropical cyclone, occurring in the North Atlantic Ocean or the Northeast Pacific Ocean, east of the International Dateline(国际日期变更线). A wind of force 12 on the Beaufort scale(蒲福风级) above 118 km/h, is also referred to as a hurricane irrespective of its origin or location.And the center of hurricane has an eye, the smaller the hurricane eye, the greater the damage. The crucial factor for the formation of a hurricane is the surface depression caused by the warm water and warm water is its power "fuel". And it can be dvided into five level.But every kind level of hurricane all can result in a serious threat to people's life, property, the people's livelihood, agriculture, economy and so on ,because of usually accompanying by strong winds, heavy rain . There are some genuine and believable examples that can account for such damage. In September 1900 America, , a hurricane , one of the ten deadliest hurricanes attacks in Galveston, Texas(德克萨斯州加尔维斯敦) ,which caused great death about between 8000 and 12000 and floded its 12 streets.Another examle is that as result of a well known hurricane ,Sandy, durning october,2012, attacking so many places including古巴Cuba、牙买加Jamaica、海地Haiti and so on , this phenomenon led to a large amount of property loss and casualties Facing the great threats to humanbeings , people had better take actions to aviod getting great damage . Hurricane warnings are usually released before it may be coming, then peole should reinforce the doors and Windows, roof and reserve drinking water, food, clothing, and lighting appliances. 本文来源：https://www.wddqw.com/doc/c75cc08b2cc58bd63186bd81.html