Extracting Variables Using Wgrib

[Scott Weaver]

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