WRF ARW User's Guide - MMM - UCAR

WPS
To get around portability issues, the NCEP GRIB libraries, w3 and g2, have been
included in the WPS distribution. The original versions of these libraries are available for
download from NCEP at http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2/. The specific
tar files to download are g2lib and w3lib. Because the ungrib program requires modules
from these files, they are not suitable for usage with a traditional library option during the
link stage of the build.
Required Compilers and Scripting Languages
The WPS requires the same Fortran and C compilers as were used to build the WRF
model, since the WPS executables link to WRF's I/O API libraries. After executing the
./configure command in the WPS directory, a list of supported compilers on the
current system architecture are presented.
WPS Installation Steps
• Download the WPSV3.TAR.gz file and unpack it at the same directory level as
WRFV3, as shown below.
> ls
-rw-r--r-- 1 563863 WPS.TAR.gz
drwxr-xr-x 18 4096 WRFV3
> gzip -d WPSV3.TAR.gz
> tar xf WPSV3.TAR
> ls
drwxr-xr-x 7 4096 WPS
-rw-r--r-- 1 3491840 WPSV3.TAR
drwxr-xr-x 18 4096 WRFV3
• At this point, a listing of the current working directory should at least include the
directories WRFV3 and WPS. First, compile WRF (see the instructions for
installing WRF). Then, after the WRF executables are generated, change to the
WPS directory and issue the configure command followed by the compile
command as below.
> cd WPS
> ./configure
o Choose one of the configure options
> ./compile >& compile.output
• After issuing the compile command, a listing of the current working directory
should reveal symbolic links to executables for each of the three WPS programs:
geogrid.exe, ungrib.exe, and metgrid.exe. If any of these links do not exist, check
the compilation output in compile.output to see what went wrong.
WRF-ARW V3: User’s Guide 3-6