Lee ebe a n'okpuru ma zaa ajụjụ a n'otu asụsụ ahụ dị ka ebe a: Ebe a: A lee trough, makwaara dị ka a ike trough, bụ "A mgbali trough kpụrụ na lee n'akụkụ nke a ugwu n'ọnọdụ ebe ifufe na-afụ na a ịrịba akụrụngwa gafee ugwu ugwu; mgbe mgbe hụrụ na United States ihu igwe map ọwụwa anyanwụ nke Rocky Ugwu, na mgbe ụfọdụ n'ebe ọwụwa anyanwụ nke Appalachians, ebe ọ bụ obere kpara. "Ọ nwere ike kpụrụ ma n'ihi na adiabatic mkpakọ nke sinking ikuku na lee n'akụkụ nke a ugwu, ma ọ bụ site cyclogenesis n'ihi na "ndị kwụ ọtọ convergence jikọtara na vetikal agbatị nke ikuku ogidi agafe n'elu ugwu na-agbadata lee mkpọda". Ajụjụ: Olee otú a lee trough nwere ike kpụrụ?
ma ọ bụ n'ihi mkpakọ adiabatic nke ikuku na-emikpu n'akụkụ mmiri nke ugwu, ma ọ bụ site na cyclogenesis nke sitere na "njikọ ihu igwe jikọtara ya na mgbatị kwụ ọtọ nke ogidi ikuku na-agafe n'elu ugwu ahụ ma na-agbadata mkpọda mmiri