Isobars on a surface map is a map that has lines of equal atmospheric pressure drawn on a meteorological map. Each line passes through a pressure of a given value given that isobar lines may never cross or touch. Isobar lines may only pass through pressures of 1000 millibars, give or take four millibars. Pressure lines are usually corrected by the sea level height standard so any differences in pressure due to altitude can be ignored since altitude can change drastically along the United States. The image shown above is a surface map with isobars that depict areas of high pressure and low pressure with isobar lines. Spaced out isobar lines indicate negligible pressure changes while areas with isobars that were close together indicates a large change in pressure.
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