Isobar

This image is an Isobaric map of the United States.This Isobaric map has isobars (yellow solid lines) that show air pressure variation. Isobars are similiar to contour lines , in that the closer to proximity that they are to each other the greater the wind pressure.

Image was taken from: http://http://www.google.com/imgres?imgurl=http://www.solcomhouse.com/images/isobar.gif&imgrefurl=http://www.solcomhouse.com/windpower.htm&usg=__GMFCNznUDX7ICEmR-scnyUi_8ps=&h=768&w=1024&sz=228&hl=en&start=0&sig2=E-HTtX4_AA8gV9yxuA1jQA&tbnid=aJWm3wdwSLmAgM:&tbnh=127&tbnw=169&ei=QE5TTNzZFMaqlAfnk-lt&prev=/images%3Fq%3Disobars%2Bmap%26hl%3Den%26biw%3D1276%26bih%3D579%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=hc&vpx=583&vpy=110&dur=120&hovh=194&hovw=259&tx=98&ty=88&page=1&ndsp=19&ved=1t:429,r:3,s:0