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a type of Atlantic winter storm associated with mP air mass have source regions in warm tropical waters formed when mT air intrudes the southwesern U.S. general name for a narrow zone separating two air masses a large body of cool, damp air occlusion in which cold front displaces slightly warmer air the elevation marking the change from snow to rain formed when a cold air mass displaces a warmer one the place where an air mass attains its characteristics warm air mass meets colder air mass, but neither advances occlusion in which mP air displaces cP air a large body of warm, dry air any meeting of cold and cool air with warm air pushed aloft a colder version of a cP air mass a large body of air with similar atmospheric characteristics formed when a warm air mass displaces a colder one boundary separating humid and dry air at similar temps a type of storm that approaches California from Hawaii warm air flowing upward along a warm frontal boundary have cold dry conditions over large areas; often invade US separates polar air mass from Arctic air mass