Yanayin tafiyar iska
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A cikin yanayin yanayi, gaban da aka rufe wani nau'in yanayin yanayin gaba,ne da aka kafa yayin kewayawa. Ra'ayin gargajiya da na al'ada na gaban da aka rufe shi ne cewa yana farawa ne lokacin da sanyin gaba ya mamaye gaba mai dumi kusa,da guguwa, ta yadda za a raba iska mai dumi (wanda aka ɓoye) daga cibiyar guguwar a saman. Ma'anar inda gaban dumi ya zama gaban da aka rufe shi ne maki uku ; wani sabon yanki na ƙananan matsa lamba wanda ke tasowa a wannan lokaci ana kiransa sau uku-point low . Ƙarin ra'ayi na zamani game da tsarin samuwar yana nuna cewa ɓangarorin gaba suna tasowa kai tsaye ba tare da tasirin wasu gaba ba yayin da ake kunsa yankin baroclinic a lokacin cyclogenesis, sannan kuma ya tsawaita saboda lalacewa mai gudana da juyawa a kusa da cyclone kamar yadda guguwa ta kasance.