An isobar is something that is used to show barometric pressure in the atmosphere. It shows it by a bunch of small lines or bars. The small lines that you see going throughout the image are the isobars. They show the change in pressure throughout the atmosphere.Map found here: http://www.newmediastudio.org/DataDiscovery/Hurr_ED_Center/Hurr_Structure_Energetics/Closed_Isobars/Closed_Isobars.html
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