WRF ARW User's Guide - MMM - UCAR

ls
drwxr-xr-x 2 4096 arch
-rwxr-xr-x 1 1672 clean
-rwxr-xr-x 1 3510 compile
-rw-r--r-- 1 85973 compile.output
-rwxr-xr-x 1 4257 configure
-rw-r--r-- 1 2486 configure.wps
drwxr-xr-x 4 4096 geogrid
lrwxrwxrwx 1 23 geogrid.exe -> geogrid/src/geogrid.exe
-rwxr-xr-x 1 1328 link_grib.csh
drwxr-xr-x 3 4096 metgrid
lrwxrwxrwx 1 23 metgrid.exe -> metgrid/src/metgrid.exe
-rw-r--r-- 1 1101 namelist.wps
-rw-r--r-- 1 1987 namelist.wps.all_options
-rw-r--r-- 1 1075 namelist.wps.global
-rw-r--r-- 1 652 namelist.wps.nmm
-rw-r--r-- 1 4786 README
drwxr-xr-x 4 4096 ungrib
lrwxrwxrwx 1 21 ungrib.exe -> ungrib/src/ungrib.exe
drwxr-xr-x 3 4096 util
Running the WPS
There are essentially three main steps to running the WRF Preprocessing System:
WPS
1. Define a model coarse domain and any nested domains with geogrid.
2. Extract meteorological fields from GRIB data sets for the simulation period with
ungrib.
3. Horizontally interpolate meteorological fields to the model domains with metgrid.
When multiple simulations are to be run for the same model domains, it is only necessary
to perform the first step once; thereafter, only time-varying data need to be processed for
each simulation using steps two and three. Similarly, if several model domains are being
run for the same time period using the same meteorological data source, it is not
necessary to run ungrib separately for each simulation. Below, the details of each of the
three steps are explained.
Step 1: Define model domains with geogrid
In the root of the WPS directory structure, symbolic links to the programs geogrid.exe,
ungrib.exe, and metgrid.exe should exist if the WPS software was successfully installed.
In addition to these three links, a namelist.wps file should exist. Thus, a listing in the
WPS root directory should look something like:
> ls
drwxr-xr-x 2 4096 arch
-rwxr-xr-x 1 1672 clean
-rwxr-xr-x 1 3510 compile
-rw-r--r-- 1 85973 compile.output
-rwxr-xr-x 1 4257 configure
-rw-r--r-- 1 2486 configure.wps
WRF-ARW V3: User’s Guide 3-7