An isobar is a commonly used chart in meteorology that shows equal barometric pressure. There are four rules when drawing isobars. 1. Isobars can never cross or touch. 2. Isobar lines can only pass through pressures of 1000 +/- 4. 3. The atmospheric pressure is given in millibars. 4. Different pressures due to elevation are ignored. The isobar map pictured above exhibits the different levels for pressure during a low-pressure system near West Virginia and Ohio.
http://rst.gsfc.nasa.gov/Sect14/Sect14_1c.html
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