Isobar map - Northern Hemisphere

http://www.srh.noaa.gov/ffc/?n=mapslast - then click on "Northern Hemisphere"

Isobars are lines of equal pressure.  This map features the Northern Hemisphere and its pressure systems with isobars at a glance.  The isobars are in orange, the High Pressure areas are in blue and the Low Pressure areas are in red.  On this particular day, July 22, 2014, Central America seemed to have a concentrated area of high pressure, while low pressure dominated a bit more in Eastern Asia.  It also looks like there is a potential low pressure system developing in the Atlantic – you can see this by the circular isobars.  If the pressure continues to drop, this may form a tropical depression, but that is difficult to predict from this map.