WRF ARW User's Guide - MMM - UCAR

WRF-VAR
clwp: cloud liquid water path from model
si: scatter index from obs, for amsua, amsub and
mhs only
export CLWP_VALUE=0.2 only plot points with
clwp >= clwp_value (when clwp_value > 0)
clwp > clwp_value (when clwp_value = 0)
export SI_VALUE=3.0
(5) evolution of VarBC parameters
NCL scripts (WRFDA/var/graphics/ncl/plot_rad_varbc_param.ncl and
WRFDA/var/graphics/ncl/advance_cymdh.ncl) are used for plotting evolutions
of VarBC parameters.
WRF-Var Diagnostics
WRF-Var produces a number of diagnostic files that contain useful information on how
the data assimilation has performed. This section will introduce you to some of these
files, and what to look for.
Having run WRF-Var, it is important to check a number of output files to see if the assimilation
appears sensible. The WRF-Var package, which includes lots of useful scripts
may be downloaded from
http://www.mmm.ucar.edu/wrf/users/wrfda/download/tools.html
The content of some useful diagnostic files are as follows:
cost_fn and grad_fn: These files hold (in ASCII format) WRF-Var cost and gradient
function values, respectively, for the first and last iterations. However, if you run with
PRINT_DETAIL_GRAD=true, these values will be listed for each iteration; this can be helpful
for visualization purposes. The NCL script
WRFDA/var/graphcs/ncl/plot_cost_grad_fn.ncl may be used to plot the content of
cost_fn and grad_fn, if these files are generated with PRINT_DETAIL_GRAD=true.
WRF-ARW V3: User’s Guide 6-29