a region of air where the barometric pressure is higher than the pressure in the area that surrounds it. In this weather system, the air is relatively cooler and subsiding; has diverging, out-flowing winds; and rotates opposite the Earth’s rotation—clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. It is the opposite of a low-pressure system or cyclone. The winds are lighter near the center and increase in speed as they move towards the outer edge of a high-pressure system. To remain in wind when sailing near a high pressure system, stay at least two isobars (8 mb) away from the area of peak pressure. Known as an anti-cyclone to British and Commonwealth sailors. See also: North Atlantic High, North Pacific High, stable and surface analysis. Compare to: low-pressure system.

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Bob Roitblat is an avid sailor, writer and professional speaker. If you have any comments about this blog, or you are interested in having Bob to speak at your club, contact the author here: bob@sailorspeak.com

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