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Air Masses Cornell Notes What is an air mass? A huge body of air that has similar temperature, humidity, and air pressure throughout it How do air masses move? From the West to the East What is a front? The area where the air masses meet and do not mix What are the four types of 1. Cold front fronts? 2. Warm front 3. Stationary front 4. Occluded front What determines the kind of front that develops? The characteristics of the air masses and how they are moving Describe a cold front When a rapidly moving cold air mass slides under the lighter warm air May bring precipitation May only have cloudy skies Move quickly which causes abrupt weather changes like violent thunderstorms When it passes it leaves cool dry air with clear skies and cooler temperatures Describe a warm front A moving warm air mass collides with a slowly moving cold air mass and moves over the cold air Brings clouds, storms and rain Humid warm air brings showers and light rain along the front Dry warm air brings scattered clouds Could bring rainy or foggy weather for several days When it passes the weather will be warm and humid In winter could bring snow Describe a stationary front When a cold and warm air mass meet and neither has enough force to push out the other Forms rain, snow, fog or clouds Brings days of clouds and precipitation Describe an occluded front A warm air mass is caught between two cooler air masses Warm air mass on top with two cooler air masses mixing Temperature near the ground is cold May bring cloudy and rainy or snowy weather Summary: Describe all four types of fronts.