[gradsusr] cat *grib* > big_grib messes time frames

Davide Sacchetti davide.sacchetti at arpal.gov.it
Mon Oct 29 11:15:43 EDT 2018

I never experienced errors concatenating grib files, also with hundreds
of grib and with resulting file of 1GB.
I would check control file, also check if grib grids are all identical
or not, if analysis is the same for all grib, if time step is
comapatble ... 
The method cat *wrfprs* > grib.grb2 normally works.

Bye bye

On Mon, 2018-10-29 at 15:15 +0100, Ivan Toman wrote:
> Hello GrADS users,
> I'm experiencing problem with concatenating multiple gribs into
> single 
> one if there are more than 255 grib files. If there is 255 or less, 
> something like
> cat *wrfprs* > grib.grb2
> works as expected.
> But, if I include 256 or more wrfprs gribs, time frames start to
> mess 
> around (ie first frame in big grib is obvously not first
> frame/analysis 
> of wrf simulation, although wgrib2 and GrADS say it is correct time).
> I don't think there is size problem because gribs are relatively
> small 
> and resulting big grib is under 400MB. I use grib2 format.
> Did anyone experienced similar problem? Any other method to
> concatenate 
> gribs into single one that might work better?
> Thank you
> Ivan Toman
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