Isobar- a line connecting points with the same atmospheric pressure at a given time or the same average over a given period.
An isobar is another type of isoline. Isobars connect areas with equal pressure, and can help determine areas of high and low pressure. In the map above, the isobars indicate an area with rapidly changing pressure, which led to very high winds across the area. This map is from May 6, 1999, and the website it came from provides an analysis of why the high winds were created.
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