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

[Ivan Toman]

Hello

The problem was in precipitation because of cnvgrib:
http://www.ftp.cpc.ncep.noaa.gov/wd51we/wgrib2/tricks.wgrib2 (number 43).

I fixed it by outputting grib2 directly from UPP instead of grib2/cnvgrib.

Ivan




On 10/29/18 3:15 PM, 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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