Isobars, on a map, indicate, in a manner similar to the contour lines on a topographic map, the barometric pressure of an area. These lines show the grades of increase and decrease in pressure across an area. This map shows a low-pressure system centered over the Great Lakes.
http://www.newmediastudio.org/DataDiscovery/Hurr_ED_Center/Hurr_Structure_Energetics/Closed_Isobars/Closed_Isobars_fig02.jpg
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