Pre-processing using WPS

Use WPS for pre-processing

Before running geogrid, in namelist.wps file, make sure that geog_data_path variable set to the location where you put your geography static data (for ring, the location is /home/rus043/wrf/data/). Once that is set, you can run geogrid:

./geogrid.exe &> log.geogrid

If you successfully created a geo_em* file for each domain, then you are ready to prepare to run ungrib. Start by linking in the input GFS data (for ring, the location is /home/rus043/wrf/data/ds609.2):

./link_grib.csh path_where_you_placed_GFS_files

Then link to the correct Vtable (GFS, for this case):

ln -sf ungrib/Variable_Tables/Vtable.GFS Vtable

# For grib1 ds609.2 data (before 01/01/2013)
ln -sf ungrib/Variable_Tables/Vtable.AWIP Vtable
# For grib2 ds609.2 data (after 01/01/2013)
ln -sf ungrib/Variable_Tables/Vtable.NAM Vtable

Then run the ungrib executable:

./ungrib.exe

You should now have files with the prefix “FILE” (or if you named them something else, they should have that prefix)

You are now ready to run metgrid:

./metgrid.exe >& log.metgrid

You should now have files with the prefix met_em* for each of the time periods for which you are running.

How to download the wrf geography static data?

The WRF geography static data is available here:

http://www2.mmm.ucar.edu/wrf/users/download/get_sources_wps_geog.html

How to download the ds609.2 data?

The ds609.2 data is available here:

https://rda.ucar.edu/datasets/ds609.2/#!access

How to download other data?

The following free datesets and the corresponding VTables are available:

http://www2.mmm.ucar.edu/wrf/users/download/free_data.html