ncl_convert2nc problem

Hi there

I'm trying to convert some AMPS forecast data (in GRIB format; see
http://www.mmm.ucar.edu/rt/amps/wrf_grib/) into netCDF using
ncl_convert2nc.

I'm having a problem with the resulting g5_lon_1 and g5_lat_0 fields.
The calculated latitudes/longitudes are stepping South and West from the
origin, rather than North and East. i.e. from a grid definition of:

  Nx = 213 ;
  Ny = 228 ;
  La1 = -78.358002 ;
  Lo1 = 156.606995 ;
  Lov = 180.000000 ;
  Dx = 1598.000000 ;
  Dy = 1598.000000 ;
  // Pole in proj. plane = South ;
  ProjFlag = 1 ;
  ResCompFlag = 8 ;

I end up with corners of: lat ( -78.358, -76.73927, -79.32224, -81.42978
), lon (156.606, 143.6038, 132.4332, 147.3015)...where the lat/lon range
should be ~ (-78 -> -75) and ( 156 -> 180).

Any ideas? Or could someone point me towards the transformation
algorithm, so that I can encode it myself.

Thanks

Steve

-- 
Dr Steve George
University of Canterbury
Christchurch, NZ
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