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33 - Cold air mass overtakes and replaces warm air Cloud...

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The 2 air masses that are most important to the U.S. and southern Canada east of the Rocky Mountains: cP (north central Canada) mT (Gulf of Mexico) Air Masses North American Air Masses: cA—very cold, dry cP—cold, dry mP—cool, moist mT—warm, moist cT—hot, dry Front : surface of contact between two unlike air masses Fronts Identifies a zone of transition between air of different properties. EX: Often represent the boundaries between polar and tropical air. (temperature differences) Cold front : moving weather front along which a cold air mass moves underneath a warm air mass, lifting the warm air mass. Cold air is much denser than warm and remains in contact with the ground.
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Unformatted text preview: Cold air mass overtakes and replaces warm air. Cloud types: Cumulus and cumulonimbus clouds Weather: Thunderstorms Warm Front Warm air mass replaces cold air Warm front : moving weather front along which a warm air mass slides over a cold air mass, producing stratiform clouds and precipitation Clouds: Stratus, nimbostratus Weather: steady precipitation, sometimes thunderstorms. Stationary Front A front that is stationary with winds blowing almost parallel and from opposite directions on each side of the front. The two air masses are in contact with one another but with little motion. Weather map symbols Occluded Front – closed or shut off....
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