Two NCL scripts (available as part of the WRFDA Tools package, which can be downloaded at http://www2.mmm.ucar.edu/wrf/users/wrfda/download/tools.html) are used for plotting: $TOOLS_DIR/var/graphics/ncl/plot_rad_diags.ncl and $TOOLS_DIR/var/graphics/ncl/advance_cymdh.ncl. The NCL scripts can be run from a shell script, or run alone with an interactive ncl command (the NCL script and set the plot options must be edited, and the path of advance_cymdh.ncl, a date-advancing script loaded in the main NCL plotting script, may need to be modified).