http://images.google.com/imgres?imgurl=http://www.uwlax.edu/faculty/skala/Image58.gif&imgrefurl=http://www.uwlax.edu/faculty/skala/Air-Pressure.htm&h=650&w=900&sz=29&hl=en&start=2&tbnid=C45iMAmp8OCR9M:&tbnh=105&tbnw=146&prev=/images%3Fq%3Disobar%26gbv%3D2%26hl%3DenThe above map is a map with isobar of the United States from September 8, 1998. An isobar is a type of contour map where a line on the map that connects points of equal atmospheric pressure. It measures air pressure to help predict the weather patterns.
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