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polar front

The Columbia Encyclopedia, Sixth Edition

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 .

Author not available, POLAR FRONT., The Columbia Encyclopedia, Sixth Edition 2008


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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press

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Jet streams: fast and furious: weatherwatch with BBC weather forecaster Helen Willetts.(Worldwatch)
; ...and warm tropical air moving north. Its position...our weather? The Polar Front Jet has a huge influence...differ? While the Polar Front Jet and Equatorial...Effect. As ascending air in the high troposphere...jet streams? The Polar Night Jet is much... Read more
You be the forecaster.
; ...This leads to the assumption that the polar front is in Ontario. However, a cardinal rule...scientific literature, states that the polar front must be placed on the warm side of a...Falls, South Dakota. Therefore, the polar front is actually located in the central and... Read more
MISSING WINTER? NOT TO WORRY.(LOCAL)
; ...Speicher, the turnaround in the weather is caused by a shifting polar front and pressure systems. We've got a low pressure system coming...from the Gulf of Mexico. Once that thing blasts through, the polar front is going to be tipping to the south and it's going to bring... Read more
Millennium perspectives
; ...and influential developments in synoptic meteorology are the Polar Front Theory of atmospheric circulation and the development of dynamical...as telegraphic means of communication became available. The Polar Front Theory, presented in a remarkable series of three papers by... Read more
Synoptic and frontal-cyclone scale instabilities in baroclinic jet flows
; ...have allowed the introduction of modifications to the early "Polar Front" model of cyclogenesis proposed by Bjerknes and Solberg (1922...are a typical feature of the midlatitude weather system. The polar front theory of Bjerknes and Solberg (1922) actually proposed that... Read more
Polar front set to bring temperature drop today.
; ...spring weather just couldn't last. That was the warm version of April in the Inland Northwest. Get ready for the cold one. A polar front out of Canada was pushing southward Tuesday, and it is expected to bring windy conditions and an 18-degree drop from Tuesday... Read more
The new meteorology. (includes related articles)(Cover Story)
; ...line circling the Northern Hemisphere. He called the line the polar front, because the violent clashes of cold and warm air reminded...key discovery. The warm and cold air on either side of the polar front are made up of discrete air masses (high-pressure areas) of... Read more
Forecast center.
; During the summer months, the polar front jet retreats north into Canada. The United States comes under...northeasterly during the warm season. In southeast Canada, the polar front jet was active and a powerful weather system was on the march... Read more
The weatherman and the millionaire: how Carl-Gustaf Rossby and Harry F. Guggenheim revolutionized aviation and meteorology in America.(Biography)
; ...of its theoretical doldrums with their breakthroughs in the polar front theory and air mass analysis. The young Swede was totally...when he secured a fellowship to export the innovations of the polar front theory to the U.S. Weather Bureau, Rossby jumped at the chance... Read more
The Antarctic circumpolar current between the Falkland Islands and South Georgia
; ...and the other two with branches of the Polar Front (PF) over the sill of the Falkland Plateau...Georgi, and H. W. Taylor, 1977: Antarctic Polar Front zone in the western Scotia Sea-Summer...Variability in the location of the Antarctic Polar Front (90-20'W) from satellite sea ... Read more

Related entries from encyclopedias, dictionaries, and thesauruses

polar-front jet stream
polar-front jet stream The jet stream observed in different positions over...x2013;13 km, and associated with the boundary zone between polar and tropical air above the polar front . Maximum velocity averages 60 m/s, but can be twice this in... Read more
polar-front jet stream
polar-front jet stream The jet stream that is observed in different positions...x2013;13 km, and is associated with the boundary zone between polar and tropical air above the polar front . Maximum velocity averages 60 m/s, but can be twice this in... Read more
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... Read more
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... Read more
Antarctic polar front
Antarctic polar front See ANTARCTIC CONVERGENCE . Read more

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