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polar front

polar front, zone of transition between polar and tropical air masses. Its average position during the winter is at about 30° lat. and during the summer at about 60° lat. In the N Atlantic Ocean, for example, the polar front can often be traced as a continuous line extending over thousands of miles, usually toward the northeast from a point just off the coast of the United States at about 30°N. Most cyclones outside the tropics develop along the polar front from waves caused by the juxtaposition of cold air moving toward the equator and hot air moving toward the poles; the earth's rotation gives this air its cyclonic twist. See front.

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"polar front." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 22 May. 2017 <http://www.encyclopedia.com>.

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"polar front." The Columbia Encyclopedia, 6th ed.. . Retrieved May 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/polar-front

polar front

polar front The main boundary line between polar and tropical air masses along which depressions develop in mid latitudes, especially over the oceans. The front is in general displaced towards the equator in winter and the poles in summer, though large displacements in either direction take place over shorter periods in individual sectors of the hemisphere.

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"polar front." A Dictionary of Ecology. . Encyclopedia.com. 22 May. 2017 <http://www.encyclopedia.com>.

"polar front." A Dictionary of Ecology. . Encyclopedia.com. (May 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/polar-front-0

"polar front." A Dictionary of Ecology. . Retrieved May 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/polar-front-0

polar front

polar front The main boundary line between polar and tropical air masses along which depressions develop in mid latitudes, especially over the oceans. The front is in general displaced equatorwards in winter and polewards in summer, though large displacements in either direction take place over shorter periods in individual sectors of the hemisphere.

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"polar front." A Dictionary of Earth Sciences. . Encyclopedia.com. 22 May. 2017 <http://www.encyclopedia.com>.

"polar front." A Dictionary of Earth Sciences. . Encyclopedia.com. (May 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/polar-front

"polar front." A Dictionary of Earth Sciences. . Retrieved May 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/polar-front