"A line drawn on a weather map connecting points of equal pressure is called an isobar. The isobars are generated from mean sea level pressure reports and the pressure values are given in millibars (http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/prs/isb.rxml)." This picture shown above is actually an example of parallel isobars.
http://www.newmediastudio.org/DataDiscovery/Hurr_ED_Center/Hurr_Structure_Energetics/Closed_Isobars/Closed_Isobars_fig01.jpg
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