Nested Domain (2-way, 2 Input Files): Real and WRF

Using both meteorological and static data for domain 2

1. Ensure you are in the WRFV3/ directory. For this case we are going to run in the test/em_real/ directory.

cd test/em_real

2. Edit namelist.input
    Add the changes below to the namelist.input file. Pay special attention to the highlighted values.
    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.

run_days = 0,
run_hours = 48,
run_minutes = 0,
run_seconds = 0,
start_year = 2016, 2016,
start_month = 10, 10,
start_day = 06, 06,
start_hour = 00, 00,
end_year = 2016, 2016,
end_month = 10, 10,
end_day = 08, 08,
end_hour = 00, 00,
interval_seconds = 21600
input_from_file = .true., .true.,
history_interval = 180, 60,
frames_per_outfile = 1000, 1000,
restart = .false.,
restart_interval = 5000,
time_step = 150,
max_dom = 2,
s_ we = 1, 1,
e_we = 91, 88,
e_sn = 100, 79,
e_vert = 35,35,
num_metgrid_levels = 32
dx = 27000, 9000,
dy = 27000, 9000,
i_parent_start = 1, 23,
j_parent_start = 1, 46,
parent_grid_ratio = 1, 3,
parent_time_step_ratio = 1, 3,
feedback = 1,

Note: The only difference between this run and the 2-way, 1-input run, is the "input_from_file=.true.", setting used for domain 2.
 

3. Link in the met_em files created with metgrid.exe

ln -sf ../../../WPS/met_em.d0*.2016-10* .

4. Run real.exe (verify that the program ran correctly)
    Note: This will overwrite wrfinput_d01 and wrfbdy_d01 files you may have from previous runs,
    so save your old files somewhere else if you would like to keep them.
    Check that the following three files have been created.

wrfinput_d01
wrfbdy_d01
wrfinput_d02

    What is contained in these files?
 

5. Run wrf.exe (verify that the program ran correctly)
    Check that the following files have been created
    Note: This will overwrite wrfout_d01_2016-10-06_00:00:00 and wrfout_d02_2016-10-06_00:00:00 if you already
    have these files, so save your old files somewhere else if you would like to keep them.

   wrfout_d01_2016-10-06_00:00:00
   wrfout_d02_2016-10-06_00:00:00

The wrfout files will contain all the time periods for this run.
wrfout for domain 2 will contain more time periods, as history_interval was set to 1h for domain 2 and 3h for domain 1.
 

6. Quick check of the contents of the wrfout file:

a. Use the ncdump utility:
    ncdump -h wrfout_d01_2016-10-06_00:00:00
    ncdump -v Times wrfout_d01_2016-10-06_00:00:00 (to see which forecast times are in the file)
    Note: run_hours was set to 48, so there should only be 48 hours of output
b. Use the ncview utility.

7. Use any of the supported graphical tools to display the model output.

Run another case study