Grads 2.0 with grib2 files

[Wesley Ebisuzaki]

Oliver,

    Yes, it is a wgrib2 problem.  The next release will fix this
problem.  The problem
is that wgrib2 is saying the verification time of an averaging period
(ex. 0-3 hour
forecast of precip) is the start of the interval.  The verification time
needs to be
the end of the period to be consistent with GrADS.

        Wesley

Oliver König wrote:
> Hello Wesley (and grads users),
> I download all the grib2 files from
> ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gfs.YYYYMMDDRR/gfs.trrz.sfluxgrbfHH.grib2
> and I automaticallly extract values for certain lat/lon combinations with
> wgrib2/grads and write them into a database. Since I switched from grib1 ->
> wgrib/grads1.9 to grib2 -> wgrib2/grads2 last week only every second forecast
> time step is stored on the database. Before the change to grib2/grads2 all
> the 3 hourly forecast timesteps were generated and stored in the DB.
>
> I do "set t 2" in the grads script that generates the forecast values.
>
> Is this a wgrib2 problem?
>
> Regards,
> Oliver
>
>
> On Thursday 07 February 2008 16:30:50 Wesley Ebisuzaki wrote:
>
>> Oliver,
>>
>> If you examine the ctl file closely, you'll see that there are two time
>> steps.
>> If you do "set t 2", then all the fields will appear.  This is a temporary
>> fix until wgrib2 can be made consistent with gribmap.  (For temporally
>> averaged quantities, wgrib2 returns the time when the period started
>> and gribmap uses the time when the period ended.)
>>
>>     Wesley Ebisuzaki
>>
>> Oliver König wrote:
>>
>>> Hello,
>>> I installed Grads 2.0 binaries on Debian/GNU Linux testing (64 bit)
>>> because I want to work with grib2  data from NCEP.
>>>
>>> Installation of grads 2.0 binaries
>>> ----------------------------------
>>> $ wget ftp://iges.org/grads/2.0/grads-bin-2.0.a0-RHEL5-x86_64.tar.gz
>>> $ tar xvfz grads-bin-2.0.a0-RHEL5-x86_64.tar.gz
>>> $ cp grads-2.0.a0/bin/* /usr/bin
>>>
>>> Installation of grads data files
>>> --------------------------------
>>> $ cd /usr/local/lib/
>>> $ mkdir grads
>>> $ cd grads
>>> $ wget ftp://iges.org/grads/data.tar.Z
>>> $ tar xvfz data.tar.Z
>>>
>>> Test grib2 data in grads
>>> ---------------------------
>>> $ wget ftp://ncep.domain.tld/gfs_grib2.file
>>> $ g2ctl.pl -verf gfs_grib2.file > gfs_grib2.ctl
>>> $ gribmap -i gfs_grib2.ctl
>>>
>>> $ grads
>>> ga-> open gfs2_grib2.ctl
>>> ga-> q file
>>> ga-> d tmpsfc
>>> Cannot contour grid - all undefined values
>>>
>>> The grib2.file is from an operational NOAA/NCEP server so I guess the
>>> file and the format are okay. I managed to display grib1 data in Grads
>>> 2.0. does anyone have an idea what the problem is? Help is welcome.
>>> thanks!
>>>
>>> Regards,
>>> --
>>> Oliver König
>>>