[ncl-talk] Trouble with GFS grib table

[Walter Hannah]

Thanks Dave and Kyle,

I'm running version 6.3, so maybe I need to update the tables. Where would
I find the files to do this?

My code seems to be working ok otherwise, so I'll just ignore it for now.

Thanks,
Walter

On Thu, Jun 25, 2015 at 11:15 PM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> 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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