[gradsusr] Curious why UGRDprs does not display properly inGrADS -data from new MSC CMC regional model

[Wesley Ebisuzaki]

Greg,

|   The way I'm doing this with wgrib2 takes ~15min for the hired GDPS
lat-lon grid, which is not ideal for producing forecast graphics for
operational use.

You need to run wgrib2 on multiple cores.  The fastest way is to use
-ijsmall_grib and and follow the examples in

     http://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/for_n.html

BTW gmerge is now included with the wgrib2 source code.

        Wesley


On Wed, Jul 18, 2012 at 6:15 PM, Greg West <gwest at eos.ubc.ca> wrote:

> Wesley and Lewis,
>
> Thank you for addressing this.
>
> I'm not sure if this will fix the other problem, which is that the CMC
> grib2 files that wrap around the globe have the international date line
> grid points twice (once at the western extent of the grid, and once at the
> eastern extent of the grid). This means that, for example, the GDPS
> high-res lat/lon grid (
> http://dd.weatheroffice.ec.gc.ca/model_gem_global/high_resolution/grib2/lat_lon/)
> has 360.6 degrees longitude. GrADS doesn't recognize this as a global
> dataset since it's not 360 degrees, and so it doesn't plot properly. This
> is occurs on the lat-lon projection data, which I'm not sure if Wesley's PS
> update will fix.
>
> To get around this, I've been subsetting the grib2 files to 360 degrees
> after downloading them to get them to plot correctly in GrADS. The way I'm
> doing this with wgrib2 takes ~15min for the hired GDPS lat-lon grid, which
> is not ideal for producing forecast graphics for operational use. I'm glad
> that CMC is testing the compatibility of their grib2 files with GrADS. I'll
> re-download the latest wgrib2 and test it on the global lat-lon proj data
> in the next day or so.
>
> Greg
> ____________________________
> Greg West, PhD
> Postdoctoral Fellow
> Weather Forecast Research Team
> University of British Columbia
> EOS-Main 224
> GWest at eos.ubc.ca
> --
> Meteorologist
> Hydrology & Technical Services
> BC Hydro
> Greg.West at bchydro.com
>
>
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