Under the influence of a low pressure region ,cold air is advected from higher latitudes. Cold air is dense and slides under warm, moist air, thereby lifting and cooling it, forming a line of cloud and rain called a "front" ( a number of meteorological terms originated during the First World War).A warm front refers to warm air sliding over dense cold air, producing the same effect of adiabatic cooling,cloud and rain.An occluded front occurs when a cold front overtakes a warm front.
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