This is a simplified version of the webplot plotting library used to create graphics for the NCAR ensemble system.
For example, to create a 2-m ensemble mean temperature plot using ensemble data initialized at 2017061900, valid at 2017061912:
make_webplot.py -d=2017070500 -f=t2_mean -tr=12 -t='2-m Ensemble Mean Temperature (F)'
The package uses basemap objects that are stored as pickle files. These should be created with the saveNewMap() function in webplot.py before attempting to plot.