Nested Domain (2-way, 2 Input Files): Metgrid

Interpolate the input data onto our model domains (metgrid.exe)

1. namelist.wps

Ensure that the start and end dates are set correctly for the Katrina case, and that fg_name is set to FILE.
Note: For explanation of these variables see Chapter 3 of the WRF User's Guide, or our Best Practice WPS Namelist web page for detailed descriptions of the namelist variables, and suggestions for best practices.

start_date = '2016-10-06_00:00:00','2016-10-06_00:00:00',
end_date = '2016-10-08_00:00:00','2016-10-06_00:00:00',

Note: We only need initial information for domain 2, so we set the end date for domain 2 to be equal to the start date. You may choose to create metgrid files for domain 2 for all the time periods, but these will not be used.
 

2. Run metgrid.exe to interpolate the input data on our model domain:

./metgrid.exe

Look for "Successful completion of metgrid" at the end of the run, indicating that all went well during the execution. Also peruse the metgrid.log file for more information, or use it as a tool for troubleshooting if the run did not complete successfully.

This step will create the following files :

met_em.d01.2016-10-06_00:00:00.nc
met_em.d01.2016-10-06_06:00:00.nc
met_em.d01.2016-10-06_12:00:00.nc
met_em.d01.2016-10-06_18:00:00.nc
met_em.d01.2016-10-07_00:00:00.nc
met_em.d01.2016-10-07_06:00:00.nc
met_em.d01.2016-10-07_12:00:00.nc
met_em.d01.2016-10-07_18:00:00.nc
met_em.d01.2016-10-08_00:00:00.nc
met_em.d02.2016-10-06_00:00:00.nc
 

3. Check the contents of this file:

a. Use the ncdump utility:
    ncdump -h met_em.d01.2016-10-06_00:00:00.nc
b. Use the ncview utility.
c. This file can also be view with any of the supported graphical tools.

Run WRF using meteorological and static data for domain 2

Run WRF using ONLY static data for domain 2