Re: wrf-gribs in ncl?

Hi Erik

> I am trying to use WRF grib1 out-files in ncl but get the following
> error message for several variables:
>
> warning:NclGRIB: Unknown grib parameter number detected (130,
> center 255,
> table version 2 grib record 1), using default variable name (VAR_130)
>
> Is it at all possible to use wrf gribs in ncl? and if so, does
> anyone know a way to get around this error?

To begin, what you're seeing is a warning message, telling you that
your GRIB1 file contains a parameter
number (130) that is currently unrecnogized by NCL, for a data file
generated at a center denoted by '255.'
Because NCL doesn't recognize that parameter number, it associates
the name 'VAR_130' with it, rather than
the more descriptive name that would otherwise be defined for it.

Note that, for NCL, a center with value '255' indicates a missing
value, meaning that the center is either not
properly defined in the file, or that the center is unknown to NCL.

You can use the NCL tool 'ncl_filedump' to examine your file, and
view the various fields within it, to determine
if indeed the file has a problem, or if NCL is misreading it.

Do you know where your data files came from?

If you are unaware, WRF and NCL interaction are documented at:
http://www.ncl.ucar.edu/Applications/wrf.shtml

and

http://www.ncl.ucar.edu/Document/Functions/wrf.shtml

Please also note the WRF Users Page with respect to NCL:
http://www.mmm.ucar.edu/wrf/users/graphics/WRF_NCL/NCL.htm

----
Rick Grubin NCAR/TDD/CISL/VETS
Visualization + Enabling Technologies
grubin_at_ucar.edu 303.497.1832

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Received on Mon Jan 14 2008 - 08:57:25 MST