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Description of a Warm Front Description of a Warm Front A warm front is created by a (1)warm air mass moving (2)into a cooler area. Since the warm air is (3)less dense than the cold air, it rises up over the (4)cold air rather than pushing it aside as a (5)cold front does. As the air rises, it (6)cools and water condenses out of it. Description of a Warm Front Examine the diagram above, from right to left. This will give you an indication of what an approaching warm (7)front looks like. A day or two before the arrival of a warm (8)front, the previously clear skies get a few wispy (9)cirrus clouds. These clouds thicken, covering more of the (10)sky. Description of a Warm Front They move lower until a layer of (11)altostratus clouds covers the sky like a featureless grey blanket. Eventually the clouds are so thick that (12)rain or (13)snow begins. As the cloud base gets lower, the clouds become (14)nimbostratus clouds. Description of a Warm Front If it is very cold, (15)freezing rain or (16)sleet might develop. At about the time that the precipitation stops, the temperature (17)rises. Description of a Warm Front