Mean Sea Level Pressure Highs and Lows Ridges and Troughs Fronts Thickness Temperature Advection Definitions

Thickness If warming is taking place between 1000 and 500 mb then the column of air will expand, and thus the 1000-500 mb thickness will increase. If cooling is taking place between 1000 and 500 mb then the column of air will shrink, and thus the 1000-500 mb thickness will decrease.