I want to add the following info:
As mentioned here
http://www2.mmm.ucar.edu/wrf/users/
"The WRF system is available via free download ..."
and
"NCEP provides a variety of regional (NAM) and global (GFS) data
in GRIB format, and they can be used to initialize WRF in real-time."
as mentioned here:
http://www2.mmm.ucar.edu/wrf/users/downloads.html