Extracting Variables Using Wgrib

[Eric DeWeaver]

Hi Scott,

I've done this using :UGRD:500:|:VGRD:500:
I did each pressure level separately, not sure if
you can get multiple levels at once.

-Eric

On Fri, 27 Jan 2006, Kristian Nilssen wrote:

> can you not do something like...
> wgrib -s grib_file | egrep "(:UGRD:SEA:|:VGRD:SEA:)" | wgrib -i -grib \
>           grib_file -o new_grib_file
>
> ...just include the level in other words.
>
> Kristian.
>
>
> Scott Weaver wrote:
> > Hello everyone,
> >
> > I am trying to extract a subset of variables from a grib file.  For
> > instance U and V winds.  The original file has pressure level U and V
> > winds which I am interested in.  These are called UGRDprs and VGRDprs.
> > The file also has several other types of U and V winds which I am
> > not interested in.  (UGRD10m, UGRDhbl etc.)  when I scan the grib file
> > anything that is U or V wind is always referred to as just UGRD and VGRD
> > and not the more specific variable name.  When I do:
> >
> > wgrib -s grib_file | egrep "(:UGRD:|:VGRD:)" | wgrib -i -grib \
> >           grib_file -o new_grib_file
> >
> > It extracts all types of U and V winds.  My question is:
> >
> > Is there a way to further refine the selection so that only the pressure
> > level U and V winds are extracted.  Thank you for your suggestions.
> >
> > Regards,
> >
> > Scott
> >
> > ______________________________________________
> > Scott J. Weaver
> > PhD Candidate
> > Graduate Research Assistant
> > Department of Atmospheric and Oceanic Science
> > University of Maryland
> > College Park, MD 20742
> > 301-785-7201
> > sweaver at atmos.umd.edu
>