找一片英语故事要关于自然灾害的写关于一篇自然灾害的小文章
找一片英语故事
要关于自然灾害的
写关于一篇自然灾害的小文章
找一片英语故事要关于自然灾害的写关于一篇自然灾害的小文章
找一片英语故事
要关于自然灾害的
写关于一篇自然灾害的小文章
TropicalcyclonesareknownastyphooninthewesternPacificandashurricaneintheAtlantic.Thesestormsmostoftendevelopinthelateraummerandautumnoverjustnorthandsouthoftheequator.IntheAtlanticoceanthereareusuallyaboutsixhurricanesandtensmallertropicalstormseachyear.Butthereisnowaytoknowforsurehowmanystormswillhappeneachyearandhowseveretheywillbe.
IntheUnitedStates,expertsatthegovernmentagency,theNationlaHurricaneCenternearMiamiWatchforthedevelopmentofsevereweatherandwarnpeopleaboutthestorms.TheNationalHurricaneCenterdependsmainlyonmodernsatellitestoobservedevelopingstorms.ItalsousesinformationcollectedbypassengerairplanesandshipsandbyAmericangovernmentairplanes.
Satellitepicturesgivethescientistsagreatideaaboutweatherinalargearea.Scientistsusecomlputerstoincreasethesizeofpicturesthatshowadevelopingstorm.Theystudythesepicturestolearnmoreaboutthestorm’sdirectionandspeed.
TheNationalHarricaneCenter’sadivisoriesareconcernedmainlywithshipsintheoceanwhileastormismovingoverthewater.Butthecenter’sexpertsaremostfamousfortheirworkwhenahurricanebeginsmovingtowardsland.AtfirsttheNationalHurricaneCentermakespublicweatheradvisorieseverysixhours.Butasastormgetsclosertoland,theweatherwarningsaremadeeverythreehours.Expertsatthecenterareondutytwenty-fourhourseachdaytoprovidenewwarnings.