NCEP - parameter table

HI all,

I'm trying to open a grib files, but I'm getting the following warning:
warning:NclGRIB: Unknown grib parameter number detected (255, center 7,
table version 255 grib record 241), using default variable name (VAR_255)
I know that 255 means "missing" , but I really want to fix it.
I found in email list this link:
http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclFormatSupport.shtml#GRIB1-built-in-parameter-tables
But I didn't understand (English isn't my native language).
What I understood was that I need to set a variable NCL_GRIB_PTABLE_PATH -
In my case, something like that;
NCL_GRIB_PTABLE_PATH="/home/jean/NCL_MASTER"
and create a ".gtb" file with the follow table:
US Weather Service - NCEP (Parameter table version 141)
And I have to include the row with 255 information (missing value).

So my doubt is, where do I put the NCL_GRIB_PTABLE_PATH in my script and
how can I include the missing information at the table.

I hope my English is clear,

And I'd appreciate any help.

-- 
Jean Peres
Meteorologista
Laboratório MASTER

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Received on Thu Jul 22 09:32:56 2010