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anticyclone a large system of winds that rotates around a center of high barometric pressure, moving clockwise in the Northern Hemisphere and counterclockwise in the Southern, and usu. producing cool, dry weather. (Cf. cyclone.)
bombogenesis rapid intensification of a large storm due to a steep drop in barometric pressure.
cyclone a large system of winds that rotates around a center of low barometric pressure, moving counterclockwise in the Northern Hemisphere and clockwise in the Southern, and usu. producing destructive storms. (Cf. anticyclone.) [1/2 definitions]
isobar a line on a weather map drawn between places that have the same barometric pressure during a given time or period. [1/2 definitions]
tropical cyclone a storm originating usu. over tropical seas, characterized by very low barometric pressure, great size, and hurricane-force winds swirling about a calm eye.
trough in meteorology, a long narrow region of low barometric pressure relative to the surrounding area. [1/4 definitions]