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Upper Air Analysis Map

An Upper Air Analysis Map is a pressure level map above the surface relative to sea level, such as 850 millibars (mb), typicaly between 4500 and 5000 feet above sea level, and 500 mb, typically between 15000 and 20000 feet above sea level. The isopleths are lines of constant geopotential height.
   Geopotenital Height defined by the State Climatology office of NC
   Geopotential Height defined in National Weather Service Glossary