Analysis Nudging - Real and WRF

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

cd test/em_real

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

ln -sf ../../../WPS/met_em.d01.2016-10* .

3. Edit namelist.input
    You will note that the &fdda section in your namelist.input file is currently blank.
    Copy and paste this section from the Analysis FDDA document into your namelist.
 
    Read the Analysis FDDA document and README.grid_fdda in WRF/test/em_real/ for
   more information regarding all the fdda namelist options.
   Some of the basic fdda options are listed below.
 
    Note 1 : Set up the basic namelist variables the same as you did for the Single Domain Case.
    Note 2 : You may also read about these namelist variables in Chapter 5 of the WRF User's Guide.

&fdda
grid_fdda = 1,
gfdda_inname = "wrffdda_d<domain>",
gfdda_interval_m = 360,
gfdda_end_h = 24,
io_form_gfdda = 2,

Note: Do not change the syntax "wrffdda_d<domain>", to "wrffdda_d01". The syntax should be left exactly as above.
 

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.
    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
wrffdda_d01
 

5. Run wrf.exe (verify that the program ran correctly)
    Check that the output files have been created. If you had problems, use the log files to troubleshoot.

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)
b. Use the ncview utility.

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

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