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polar vortex
polar vortex n (General Physics) meteorol a large mass of rotating air located in the upper-middle atmospheric layers over either of the earth's poles, typically behind a polar front
polar vortex
polar vortex[′pō·lər ′vȯr‚teks] (meteorology) The large-scale cyclonic circulation in the middle and upper troposphere centered generally in the polar regions; specifically, the vortex has two centers in the mean, one near Baffin Island and another over northeastern Siberia; the associated cyclonic wind system comprises the westerlies of middle latitudes. Also known as Antarctic vortex; circumpolar whirl; polar cyclone; polar low. |