The map above is an example of an isobaric map. Isobaric maps are a type of contour map that shows the three-dimensional change is elevations of air pressure on the earth's surface. The map above is linking areas of the same air pressure together over the United Kingdom. Red contour lines represent higher air pressure. Blue contour lines represent lower air pressures. In the middle of the map we see the blue low pressure contour lines closing in on one-another. This is demonstrating the rapid decrease in air pressure taking place over that area.
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