When large masses of warm air and cold air meet, they do not mix. Instead, they form a front, usually hundreds of miles long. When a front passes, the weather changes. The chart describes the four main types of fronts and the weather changes each type brings. Type of Front Cold front
Cold air
How It Forms Forms when a cold air mass pushes under a warm air mass, forcing the warm air to rise.
Weather It Brings Thunderheads can form as the moisture in the warm air mass rises, cools, and condenses. As the front moves through, cool, fair weather is likely to follow.
Forms when a moist, warm As the warm air mass rises, air mass slides up and over it condenses into a broad a cold air mass. area of clouds. A warm front brings gentle rain or light snow, followed by warmer, milder weather.
Forms when warm and cold air meet and neither air mass has the force to move the other. They remain stationary, or “standing still.”
Where the warm and cold air meet, clouds and fog form, and it may rain or snow. Can bring many days of clouds and precipitation.
Forms when a warm air mass gets caught between two cold air masses. The warm air mass rises as the cool air masses push and meet in the middle.
The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward. Can bring strong winds and heavy precipitation.
WEATHER AND WATER • SECTION 8 AIR MASSES AND FRONTS
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