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Lab 15 Mind Map (Classification of Air Masses (Polar Air Masses develop…
Lab 15 Mind Map
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Fronts
Cold
Cold air masses move, the dense air undercuts the warmer air masses forcing the warm air up and over the colder air causing it to rise into the atmosphere.
Before the front arrives, winds ahead of the front are typically out of the south-southwest, but once the front passes through, winds usually shift around to the west-northwest
The air cools as it rises and the moisture condenses to produce clouds and precipitation ahead of and along the cold front.
The boundary of an advancing mass of cold air, in particular the trailing edge of the warm sector of a low-pressure system.
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After a cold front moves through your area you may notice that the temperature is cooler, the rain has stopped, and the cumulus clouds are replaced by stratus and stratocumulus clouds or clear skies.
Warm
The warm air mass rises, it condenses into a broad area of clouds. A warm front brings gentle rain or light snow, followed by warmer, milder weather.
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Warm fronts generally move from southwest to northeast and the air behind a warm front is warmer and more moist than the air ahead of it.
After the warm front passes conditions completely reverse. The atmospheric pressure rises slightly before falling.
The boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system.
Stationary
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A stationary front is a weather frontal [transition] zone between two air masses, where neither air mass is strong enough to advance into the other at least 5 knots at the ground surface.
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Air Masses
The Definition of Air Mass is a body of air with horizontally uniform temperature, humidity, and pressure.
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