An Isobar is an Isoline used on a synoptic chart or weather map which connects points of equal pressure. They are generated from mean sea level pressure reports and given in millibars. They are normally drawn at intervals of 2-4 millibars. Curved isobars around an area of low pressure signify a depression, while curved isobars around an area of high pressure describe an anticyclone. This weather map uses Isobars to show areas of equal pressure during Hurricane Wilma over the state of Florida in October 2005.
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