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NCL Graphics: WRF (contours only)
The purpose of this page is to show some very basic scripts for
creating contour plots of WRF variables using
gsn_csm_contour. In some cases, for
example, for debug purposes, a simple contour plot without a map or
lat/lon coordinates is desired.
Some variables are read directly from the WRF output file, while
others are read
via wrf_user_getvar.
For more meaningful plots of WRF data, see the WRF-ARW
Online Tutorial.
WRF_cn_1.ncl: A simple contour
plot of the pressure field at a specific time and level.
The default contour plot is a black-and-white line contour
plot. Setting cnFillOn to
True turns on color fill.
WRF_cn_2.ncl: This creates an
eta-longitude cross-section at a specific time and latitude.
The
gsn_csm_contour graphical
interface recognizes certain "units" attributes (eg,
"degrees_north" and "degrees_east") that conform to the
COARDS, CSM and CF netCDF convention and will label the axis
appropriately.
To emphasize contours of different sign, the
BlReWh
color map is specified. To obtain the desired effect,
symMinMaxPlt
is used to determine the appropriate contour limits.
WRF_cn_3.ncl: Creates an eta-latitude
cross-section at a specific time and longitude.
sprintf allows the user to control the label format.
WRF_cn_4.ncl: An eta-time contour plot
that requires dimension reordering to reshape the data.
lbOrientation = "vertical",
changes the label bar orientation.