WRF - Developmental Testbed Center

The GrADS package is available from: http://grads.iges.org/grads/grads.html.GrADS has an online User’s Guide at: http://grads.iges.org/grads/gadoc/ and a list ofbasic commands for GrADS can be found at:http://grads.iges.org/grads/gadoc/reference_card.pdf.A sample script named run_wrfpostandgrads, which is included in the scripts directoryof the WRF Postprocessing package, can be used to run wrfpost, copygb, and plot thefollowing fields using GrADS:• Sfcmaphh_dnn_GRADS.gif: mean SLP and 6-hour accumulated precipitation.• 850mbRHhh_dnn_GRADS.gif: 850 mb relative humidity• 850mbTempandWindhh_dnn_GRADS.gif: 850 mb temperature and wind vectors• 500mbHandVorthh_dnn_GRADS.gif: 500 mb geopotential heights and absolutevorticity• 250mbWindandHhh_dnn_GRADS.gif: 250 mb wind speed isotacs andgeopotential heightsIn order to use the script run_wrfpostandgrads, it is necessary to:1. Set the environmental variable GADDIR to the path of the GrADS fonts andauxiliary files. For example,setenv GADDIR /usr/local/grads/data2. Add the location of the GrADS executables to the PATH. For examplesetenv PATH /usr/local/grads/bin:$PATH3. Link script cbar.gs to the post-processor working directory. (This scripts isprovided in WPP package, and the run_wrfpostandgrads script makes a link fromscripts/ to postprd/.) To generate the plots above, GrADS script cbar.gs isinvoked. This script can also be obtained from the GrADS library of scripts athttp://grads.iges.org/grads/gadoc/library.html.Note: For GrADS, the precipitation accumulation period for WRF-NMM is plotted overthe subintervals of the tprec hour (set in namelist.input).Fields produced by wrfpostTable 3 lists basic and derived fields that are currently produced by wrfpost. Theabbreviated names listed in the second column describe how the fields should be enteredin the control file (wrf_cntrl.parm).WRF-NMM V3: User’s Guide 7-14