warm front

warm front

noun Meteorology.
a transition zone between a mass of warm air and the colder air it is replacing.

Origin:
1920–25

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Collins
World English Dictionary
warm front
 
n
meteorol cold front Compare occluded front the boundary between a warm air mass and the cold air above which it is rising, at a less steep angle than at the cold front

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
warm front  
The forward edge of an advancing mass of warm air that rises over and replaces a retreating mass of cooler air. As it rises, the warm air cools and the water vapor in it condenses, usually forming steady rain, sleet, or snow. On a weather map, a warm front is depicted as a red line with half circles whose curved sides point in the direction in which the warm air is moving. Compare cold front, occluded front. See illustration at front.

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