An isobars are lines drawn on a map joining places of equal average atmospheric pressure reduced to sea level for a specified period of time. This map was taken on May 6th, 1999. According to the site, the wind blew real hard across western South Dakota and portions of northeast Wyoming. The cause was the big "L" you see on the 12Z surface analysis above. Each isobar represents a 4mb pressure difference. Notice, there are 5 isobars over western South Dakota. There was a large 15mb pressure difference between the low and Rapid City.
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