[gradsusr] Reading timesteps in Arpège grib2 file

[Wesley Ebisuzaki - NOAA Federal]

Brian,

It would be much easier if you made your grib file available
by FTP.  If the file is huge or is a proprietary forecast, you can
zero out the data by

   wgrib2 file.grib -rpn 0 -grib_out file00.grb

Wesley



On Tue, Dec 15, 2015 at 4:32 PM, Brian Gaze <brian.gaze at ntlworld.com> wrote:

> Hi,
>
> I'm working with Arpège grib2 files. These should I think each contain up
> to 13 hourly forecast timesteps. If I run...
>
> g2ctl.pl -verf -b file.grib2 > file.ctl
> gribmap -i file.ctl
>
> ...I'm able to open the .ctl file in GrADS but it only has 2 timesteps. T1
> seems to be the time the model was initialized and T2 the time of the first
> forecast step.
>
>
> If I try:
>
> g2ctl.pl -b -ts1hr file.grib2 > file.ctl
> gribmap -i file.ctl
>
> It opens ok in GrADS and the correct number of timesteps are present but
> they begin from the model initialization hour rather than incrementing from
> the time of the first forecast step. For example:
>
> Model initialization: 0z 15/12
> Forecast time range contained in the file is +37 hours to +48 hours after
> initialization
>
> t2 = 1z 15/12
> t3 = 2z 15/12
> .. etc
>
> As a consequence, when I try to plot a variable the grid is undefined.
>
>
> What should I think be present is:
> t2 = 13z 16/12
> t3 = 14z 16/12
> ..etc
>
> Any suggestions / ideas on what I'm doing wrong?
>
> Thanks
>
> BWG
>
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