polar front

American  

noun

1. Meteorology. the variable frontal zone of middle latitudes separating air masses of polar and tropical origin.

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polar front British  

noun

1. meteorol a front dividing cold polar air from warmer temperate or tropical air

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polar front Scientific  

1. 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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Etymology

Origin of polar front

First recorded in 1915–20