cold core low cold core low known upper level low cold core cyclone cyclone aloft associated cold pool air residing high altitude earth low pressure system height accordance thermal wind relationship systems referred upper level lows weak surface circulation forms response feature subtropical latitudes eastern north pacific north indian oceans called subtropical cyclone cloud cover rainfall mainly occurs systems day severe weather tornadoes occur near center cold core lows cold lows help spawn cyclones significant weather impacts polar lows regard tropical cyclones cold lows lead directly development associated cold pool air aloft acting additional outflow channels aid development characteristics cold cyclones stronger aloft earth surface stronger areas lower pressures thermal wind relationship equation equation colder room pressure surfaces corresponds concept lower atmospheric thickness thermal wind relation indicates situation wind increases height means isolated pool cold air aloft associated feature cold center center shows area thickness minimum temperature given radius similar parallel orientation pressure gradient wind nature movement cold core cyclones erratic separated main belt steer progressively east cloud cover precipitation association cold lows occurs daylight hours sunlight earth surface atmosphere causing upward vertical motion development severe weather particularly tornadoes occur near center systems land season year winter cold core lows temperatures mid levels reach open waters deep convection forms allows polar low development possible importance cyclones mid latitudes lows extratropical cyclones tropical upper cyclones cold core lows eastern half north pacific ocean north indian ocean formation weak circulation underneath mid upper low cut main belt cold season winter called subtropical cyclone case north indian ocean formation type vortex leads onset monsoon rains wet season east_coast lows form near east cold core low sea surface temperature gradient east coast continents asia north_america southern africa australia pre existing area high pressure offshore east_coast united_states normally form months october april termed initially associated weather fronts form tandem blocking higher latitudes leads slow movement gradient east_coast lows persist week east_coast lows develop rapidly meteorological bombs year cycle formation east_coast lows near australia years transition warm cold years systems develop strong wind heavy rains waves metres height eye features weather satellite imagery importance tropical cyclones summer tropical upper trough lies trade wind region east central pacific cause tropical cyclogenesis offshore central_america western pacific tropical upper lows main cause tropical cyclones develop north 20th parallel north east east events trailing upper cyclones upper cause additional outflow channels aid intensification process tropical cyclones developing tropical disturbances help create upper upper lows wake outflow jet stream developing tropical disturbance cyclone western strong relationships areas formative tropical cyclones lower monsoon tropical upper trough tropical cyclone movement influenced cells kilometres position lead non tracks eastward movement tropics westward movement area normally dominate normally ocean temperature spanning depth metres requirements needed maintain special tropical cyclone cooler air temperatures higher altitude hpa level lead tropical cyclogenesis lower water temperatures normal certain lapse rate required force atmosphere unstable convection moist atmosphere lapse rate atmosphere relative humidity required lapse rate recent example tropical cyclone maintained cooler waters alex atlantic hurricane season hurricane waters hpa level air temperature averages tropics air tropics normally dry level giving air room wet cool favorable temperature support convection temperature hpa tropical atmosphere required initiate convection water temperature temperature requirement increases decreases sea surface temperature change hpa cold cyclone hpa temperatures fall low initiate convection explains moisture mid levels roughly hpa level normally requirement development dry air found height temperatures hpa need colder dry require greater lapse rate instability moist heights near year average temperature measured period encompassing
Cold-core low