flow fluid large collection fluid normally refers influx warmth moisture air earth atmosphere storm systems extratropical cyclones fed focused cold warm fronts tropical cyclones require large warmth moisture warm oceans order develop significantly mainly lowest kilometre atmosphere flow warm moist air cut thunderstorms associated tornadoes normally thunderstorm rain cooled outflow boundary storms begin dissipate rear jets lines act broad rain shield line accelerate forward motion thunderstorms cool air carried ground thunderstorm cuts thunderstorm destroying causing dissipation tornadoes form stronger thunderstorms grow reach mature stage rear flank thunderstorm fed rain cooled air begins wrap tornado cutting warm air previously fed tornado thunderstorms able organize lines feature known rear jet develops south mid level circulation associated northern vortex leads erosion rain broad rain shield line lead acceleration line tropical cyclones initial warm core system organized thunderstorm complex necessary formation tropical cyclone large energy needed lower atmospheric pressure inch mercury warmth moisture underlying ocean surface critical tropical cyclone strengthening significant cyclone lowest kilometre atmosphere extratropical cyclones polar theory attributed derived coastal network observation sites norway world war theory proposed main cyclone concentrated lines convergence ahead east low trailing south north west low convergence line ahead low known steering line warm trailing convergence zone referred line cold areas clouds rainfall appeared focused convergence zones belt referred warm belt term describing flow stream warm moist air originating warm sector generally extratropical cyclone advance cold slopes north south surface warm concept belt originated left edge belt sharp higher density air moving west forcing sharp slope cold area precipitation develops warm belt active precipitation warm implies potential greater development cyclone portion belt turns right left upper level westerly flow western portion belt northwest southwest cyclone contain moderate heavy precipitation air mass cold precipitation falls form heavy snow theory 1980s talked presence cold belt originating north warm flowing clockwise path northern hemisphere main belt aloft conflicting evidence phenomenon actually exists
Inflow (meteorology)