[ncl-talk] Trouble with GFS grib table

[Kyle Griffin]

Walter,

I'm not sure of the version you are running, but NCL 6.3.0 generally
doesn't produce any such errors for me when I process real-time GFS files
(including GFS analysis, I believe). I did see similar warnings in versions
of NCL prior to 6.3.0 and after the January upgrade of the GFS changed a
number of different things. Each version usually includes a fresh set of
GRIB tables, so even if you can't/don't want to update NCL (probably the
easiest solution), you should be able to at least grab the updated tables
from a new version.


Kyle

----------------------------------------
Kyle S. Griffin
Department of Atmospheric and Oceanic Sciences
University of Wisconsin - Madison
Room 1421
1225 W Dayton St, Madison, WI 53706
Email: ksgriffin2 at wisc.edu

On Thu, Jun 25, 2015 at 5:41 PM, David Brown <dbrown at ucar.edu> wrote:

> Hi Walter,
> Well the GFS analysis is not static. New parameters are added from
> time to time. NCEP updates their GRIB tables as the need arises as
> well. The tables that NCL uses are updated periodically to incorporate
> changes that NCEP makes, but there is necessarily a lag since for now
> at least this is a manual process.
> In this case, the message about parameter 191 in NCEP table 133 does
> indicate a new parameter that NCL has not yet incorporated. For the
> record, the docs
> (http://www.nco.ncep.noaa.gov/pmb/docs/on388/table2.html#TABLE133) say
> this parameter represents "Sunshine Duration" with units of seconds.
> The other messages document a record in the file that will never have
> a name. GRIB 1 generally uses the number 255 to mean "missing". So in
> this case there is both a table with the "missing" designation and in
> that table there is a parameter that is "missing". I have no idea what
> this record is supposed to represent or why it appears. NCL is just
> letting you know about it. Perhaps the GFS folks could explain its
> purpose.
>  -dave
>
> On Thu, Jun 25, 2015 at 3:51 PM, Walter Hannah <walter at hannahlab.org>
> wrote:
> > Hi,
> >
> > I downloaded some analysis data from the NOMADS server, specifically:
> >
> > http://nomads.ncdc.noaa.gov/data/gfsanl/
> >
> > But when I try to read the files with NCL, I get this message:
> >
> > warning:NclGRIB: Unrecognized parameter table (center 7, subcenter 0,
> table
> > 255), defaulting to NCEP operational table: variable names and units may
> be
> > incorrect
> > warning:NclGRIB: Unknown grib parameter number detected (255, center 7,
> > table version 255 grib record 3), using default variable name (VAR_255)
> > warning:NclGRIB: Unknown grib parameter number detected (191, center 7,
> > table version 133 grib record 240), using default variable name (VAR_191)
> >
> > Looking at some previous ncl-talk tthreads, I think I understand the
> issue,
> > but I'm confused that the GFS analysis wouldn't be consistent with the
> > default NCEP grib tables.
> >
> > Can anyone shed some light on what's going on here?
> >
> > Thanks,
> > Walter
> >
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