Meteorology. the variable frontal zone of middle latitudes separating air masses of polar and tropical origin.
(meteorol) a front dividing cold polar air from warmer temperate or tropical air
polar front
The region or boundary separating air masses of polar origin from those of tropical or subtropical origin. The position of the polar front during winter in a particular hemisphere is at approximately 30° latitude, while in the summer it is at approximately 60° latitude. The convergence of warm and cool air masses along the polar front often produces cyclonic wind systems.


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