Answer: Constant pressure charts like the 500 mb chart shown below may seem obvious to interpret. It has many features similar to what you might see on the surface analysis chart.

Answer: Constant pressure charts like the 500 mb chart shown below may seem obvious to interpret. It has many features similar to what you might see on the surface analysis chart.

First, a constant pressure chart depicts a surface that is represented by the msl height of a single pressure (e.g., 500 millibars [mb]). Meteorologists refer to this as geopotential height.