Sea-Level Pressure 2
Sea-Level Pressure 2 : The atmospheric pressure at mean sea level, either direcdy measured or, most commonly, empirically determined from the observed station pressure. In regions where the earth's surface is above sea level, it is standard observational practice to reduce the observed surface pressure to the value that would exist at a point at sea level direcdy below if air of a temperature corresponding to that actually present at the surface were present all of the way down to sea level. In actual practice, not the current temperature but the mean temperature for the preceding twelve hours is employed. This "reduction of pressure to sea level" is responsible for many anomalies in the pressure field in mountain areas on the surface synoptic chart
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