Instructions for crossections
Choose a variable with multiple levels (temperature, geopotential heights, omega, humidity, wind, or potential temp).
Fro 'plot region' choose latitude by height or longitude by height.
For latitude by height plots, choose a latitudinal extent and a range of longitudes (or a single longitude) over which to average.
For longitude by height plots, choose a longitudinal extent and a range of latitudes (or a single latitude) over which to average.
Choose level range (bottom to top). Note that humidity variables only go through 300mb and omega only goes to 100mb.