Source - http://www.crh.noaa.gov/unr/?n=05-06-99
Isobars are used by metoroglyist to determine the areas of equal air or atmospheric pressures. This map is the area of the northwest around North and South Dakota, Wisconsin. It depicts that the area has low air pressure, the lines will never touch as well. Isobars are used on televisions for news weather reporting.
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