Wikipedia:POTD column/February 26, 2006

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Low pressure system over Iceland

A low pressure area is a region where the atmospheric pressure is lowest with relation to the surrounding area. Air will tend to flow in to fill a low pressure area, but will be deflected perpendicular to its velocity by the Coriolis effect. A system of equilibrium can then establish itself creating circular movement, or a cyclonic flow.

Photo credit: NASA
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