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Total number of obs. = 26726<br />
Final value of J = 17643.67853<br />
Final value of Jo = 15284.64894<br />
Final value of Jb = 2359.02958<br />
Final value of Jc = 0.00000<br />
Final value of Je = 0.00000<br />
Final value of Jp = 0.00000<br />
Final J / total num_obs = 0.66017<br />
Jb factor used(1) = 1.00000<br />
Jb factor used(2) = 1.00000<br />
Jb factor used(3) = 1.00000<br />
Jb factor used(4) = 1.00000<br />
Jb factor used(5) = 1.00000<br />
Jb factor used = 1.00000<br />
Je factor used = 1.00000<br />
VarBC factor used = 1.00000<br />
*** <strong>WRF</strong>-Var completed successfully ***<br />
<strong>WRF</strong>-VAR<br />
A file called namelist.output (which contains the complete namelist settings) will be<br />
generated after a successful da_wrfvar.exe run. Those settings that appear in namelist.output<br />
that are not specified in your namelist.input are the default values from<br />
<strong>WRF</strong>DA/Registry/Registry.wrfvar.<br />
After successful completion of job, wrfvar_output (the <strong>WRF</strong>-Var analysis file, i.e. the<br />
new initial condition for <strong>WRF</strong>) should appear in the working directory along with a number<br />
of diagnostic files. Various text diagnostics output files will be explained in the next<br />
section (<strong>WRF</strong>-Var Diagnostics).<br />
In order to understand the role of various important <strong>WRF</strong>-Var options, try re-running<br />
<strong>WRF</strong>-Var by changing different namelist options. Such as making <strong>WRF</strong>-Var convergence<br />
criteria more stringent. This is achieved by reducing the value of the convergence<br />
criteria “EPS” to e.g. 0.0001 by adding "EPS=0.0001" in the namelist.input record<br />
&wrfvar6. See section (<strong>WRF</strong>-Var additional exercises) for more namelist options<br />
b. Run the Case—4D-Var<br />
To run <strong>WRF</strong>-4DVar, first create and cd to a working directory, for example,<br />
<strong>WRF</strong>DA/var/test/4dvar; next assuming that we are using the C-shell, set the working<br />
directories for the three <strong>WRF</strong>-4DVar components <strong>WRF</strong>DA, <strong>WRF</strong>NL and <strong>WRF</strong>PLUS<br />
thusly<br />
> setenv <strong>WRF</strong>DA_DIR /ptmp/$user/<strong>WRF</strong>DA<br />
> setenv <strong>WRF</strong>NL_DIR /ptmp/$user/<strong>WRF</strong>NL<br />
> setenv <strong>WRF</strong>PLUS_DIR /ptmp/$user/<strong>WRF</strong>PLUS<br />
Assume the analysis date is 2008020512 and the test data directories are:<br />
> setenv DATA_DIR /ptmp/$user/DATA<br />
> ls –lr $DATA_DIR<br />
ob/2008020512<br />
ob/2008020513<br />
ob/2008020514<br />
ob/2008020515<br />
ob/2008020516<br />
<strong>WRF</strong>-<strong>ARW</strong> V3: User’s <strong>Guide</strong> 6-17
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