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Air Masses and Fronts Notes Air Mass - a large body of air that has the same temperature and humidity. The temperature of the air mass is the same as the temperature of the area it forms over. Air masses that form over water will be wet. Air masses that form over land will be dry. Front – the area where two air masses meet Cold Front – when a cold air mass moves under a warm air mass; brings heavy rains, thunderstorms or snow and cooler temperatures Warm Front – when a warm air mass moves up and over a cold air mass; brings light rain and warmer temperatures Occluded Front – when two cold air masses move toward each other pushing up the warm air between them; brings cooler temperatures and rain or snow Stationary Front – when a warm and cold air mass meet but neither pushes the other; brings overcast or rainy weather