Hi Vanya Use the ems_post routine to process WRF Ie/ ems_post --domain 2 --grads This would process the grib2 data from your run into a grib2, idx, and ctl files required for Grads Then if you had a script say 'open 201506231200_nmm_wrfout_d02' You don't need to reference the file extention in your commands