Isobar

Isobars are lines used on an Isoline Map to connect points that have the same atmospheric pressure. These maps are used to show High and Low pressure systems of weather.


The map shown is an Isobar Map showing the Barometric Pressure over North America. The map connects the points of equal Atmospheric Pressure with lines. The map also shows the High (blue H) and Low (red L) pressure systems.


http://mitigat.com/2010/10/28/04/41/48/atmospheric-happenings-october-26-27-2010/