front
front In meteorology, the boundary between two air masses of different temperatures or different densities. Cold fronts occur when a relatively cold and dense air mass moves under warmer air. With a warm front, warmer air is pushing over colder air and replacing it. An occluded front consists of two fronts: a cold front overtakes a warm or stationary front. In a stationary front, air masses remain in the same areas and the weather is mostly unchanged.
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