चक्रवात
thumb|250px|ushnakatibandhiy chakravat chakravat kam vayumandaliy dab ke charoan or garm havaoan ki tez aandhi ko kaha jata hai. dakshini golarddh mean in garm havaoan ko 'chakravat' ke nam se janate haian aur ye gh di ki suee ke chalane ki disha mean chalati haian. jabaki uttari golarddh mean in garm havaoan ko 'hariken' ya 'taiphoon' kaha jata hai. ye gh di ki suee ke viparit disha mean chalati haian.
chakravat ka karan
garm kshetroan ke samudr mean soory ki bhayankar garmi se hava garm hokar kam vayudab ka kshetr bana deti hai. hava garm hokar tezi se oopar jati hai aur oopar ki nami se santript hokar sanghanan se badaloan ka nirman karati hai. rikt sthan ko bharane ke lie nam havaean tezi ke sath niche jakar oopar ati haian. phalasvaroop ye havaean bahut hi tezi ke sath us kshetr ke charoan taraf ghoomakar ghane badaloan aur bijali k dakane ke sath-sath moosaladhar barish karati haian.
uttari hind mahasagar ke chakravat
kshetr ke ath desh (baangladesh, bharat, maladiv, myaanmar, oman, pakistan, shrilanka tatha thailaind) ek sath milakar ane vale chakravatoan ke 64[1] nam tay karate haian. jaise hi chakravat in athoan deshoan ke kisi bhi hisse mean pahuanchata hai, soochi se agala doosara sulabh nam is chakravat ka rakh diya jata hai. is prakriya ke chalate toofan ko asani se pahachana ja sakata hai aur bachav abhiyanoan mean bhi madad milati hai. kisi nam ka doharav nahian kiya jata hai.
in ath deshoan dvara sal 2004 se chakravatoan ke namakaran ki shurooat ki gee thi. is bar nam rakhane ki bari oman ki thi. usaki soochi mean prastavit nam 'hudahud' tha, isilie kuchh hi samay pahale u disa mean aye chakravat ka nam 'hudahud' rakha gaya tha. pashchim madhy arab sagar mean bane gambhir chakravatiy toofan ko 'nilophar' nam pakistan ne diya tha.
- chakravatoan ke nam rakhane ki pravritti aaustreliya se shuroo huee thi. 19vian sadi mean yahaan chakravatoan ka nam bhrasht rajanetaoan ke nam par rakha jane laga tha.
prakar
chakravat do prakar ke hote haian-
- ushnavalayik chakravat (Tropical cyclone)
- ushnavalayapar chakravat (Extratropical cyclone)
ushnavalayik chakravat
ye vayu sangathan ya toofan haian, jo ushn katibandh mean tivr aur any sthanoan par sadharan hote haian. inase prachur varsha hoti hai. inaka vyas 50 se lekar 1000 mil tak ka tatha apekshakrit nimn vayudab vala kshetr hota hai. ye 20 se lekar 30 mil prati ghanta tak ke veg se chalate haian. inamean havaoan ke ghoomane ki gati 90 se lekar 130 mil prati ghante tak hoti hai. ye vestiandij mean 'prabhanjan'[2] tatha chin sagar evan philipin mean 'bavandar'[3] kahe jate haian.
ushnavalayapar chakravat
yah madhy evan uchch akshaanshoan ka nimn vayudab vala toofan hai. isamean havaean 20 se lekar 30 mil prati ghante ke veg se sarpil roop se chalati haian. pray: isase himapat evan varsha hoti hai. donoan prakar ke chakravat uttari golardh mean vamavart[4] tatha dakshini golardh mean dakshinavart[5] roop mean sancharit hote haian. ushnavalayapar chakravat mean sadharanat: vayu-vichalan-rekha hoti hai, jo vishuvat ki or nimn vayu keandr mean saik doan mil tak badhi rahati hai tatha garam evan nam vayu ko thandhi aur shushk vayu se prithakh karati hai.
- REDIRECTsaancha:inhean bhi dekhean
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