Isobar maps

Isobar maps use contour lines to track air pressure. This is an isobar map of europe and in this map you can see that in southern europe there is a low pressure with the air pressure concentrating around Italy and Turkey. There is also a high pressure in north western europe where there is also a concentration of air pressure. You can also see that as the Isobars concentrate around the Low pressure, the barametric pressure of each bar goes down. In the high pressure zones, the barametric pressure on each bar goes up.

http://www.windfinder.com/weather/