http://www.crh.noaa.gov/unr/?n=05-06-99
Above shown is known as an Isobar map, this map type uses lines to represent atmospheric pressure that is portrayed on a meteorological map. Each line overlays a particular pressure amount, using the values indicated for that point, meteorologists are able to read and determine pressure systems from this map. This particular map shows western South Dakota and a portion of Wyoming, this was constructed on May 6th, 1999. In this pressure system, each isobar represents a 4mb pressure difference.
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