Nested Runs - Ndown (metgrid.exe)

Interpolate the input data onto our model domains (metgrid.exe): STEP 1.2

Already have met_em files for both d01 and d02 for these domains?

YES - then continue to the next step

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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.

If you no longer have the intermediate files (FILE) created by ungrib,
you will have to re-create them first.

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 for the time we plan on starting the nest - which is 2016-10-06_00, so we set the end date for domain 2 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.
 
Note: For explanation of the namelist variables see Chapter 3 of the User's Guide, or the Best Practices WPS Namelist.
 

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 when well during the execution. Also peruse the metgrid.log file for more information.

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 real for both domains