Using GrADS tools and NARR

[Wesley Ebisuzaki]

Jorge et al.,

      More recent versions of wgrib have table 131 built in.  You should
upgrade to a new
version of wgrib.  (How old is your grib2ctl.pl?)

           Wesley

http://www.cpc.ncep.noaa.gov/products/wesley/wgrib.html


Jorge Luis Vazquez Aguirre wrote:
> Hello folks!
>
> We are trying to use NARR data to study precipitation in Mexico. But when
> using GrADS to read them the following issues had come... Any hints
> will be
> greatly appreciated.
>
> a) NCEPTAB 131
>
> When we grib2ctl a NARR file (grib) we get this:
> 'Undefined parameter table (center 7-15 table 131) using NCEP-opn.
>
> We downloaded the file nceptab_131 which looks like
>
> -1:7:-1:131
> 0:var0:undefined
> 1:PRES:Pressure [Pa]
> 2:PRMSL:Pressure reduced to MSL [Pa]
> 3:PTEND:Pressure tendency [Pa/s]
> 4:PVORT:Pot. vorticity [km^2/kg/s]
> 5:ICAHT:ICAO Standard Atmosphere Reference Height [M]
> 6:GP:Geopotential [m^2/s^2]
> 7:HGT:Geopotential height [gpm]
> 8:DIST:Geometric height [m]
> ... etc.
>
> but we do not know how to say to grib2ctl or wgrib that this table
> must be
> used instead T62 or NCEP default. Do you know how?
>
> b) NARR data are stored every 3 hours. In order to build daily
> datafiles we
> get the sum of the files for hours 03,06,09,12,15,18,21, and 00 dy+1.
> Is it
> correct?
>
> Thank you very much
>
> Jorge, Gaby, Rosa and Roberto.
> Mexico.
>
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