edit your Gib file (Digatmos.grd) to:
>FIELD
%
% C = component of a vector product (may be x or y if applicable)
% GGG = identifies a unique vector product group
%
% IDEN UNITS C GGG STYLE PARAMETER
1 * cm - slp Pressure
2 * cm - slp Pressure MSL
4 * cm - vrt Potential vorticity
7 * cm - hgt Geopotential height
17 78 cm - tms Temperature
19 * cm - tms Lapse rate
32 78 m/s - wss Wind speed
33 * m/s y wnd wss Wind u-component
34 * m/s y wnd wss Wind v-component
41 78 s - vrt Vorticity (absolute)
43 78 s - vrt Vorticity (relative)
51 78 kg/kg - mxr Specific humidity
52 * dm - rhu Relative humidity
53 78 kg/kg - mxr Humidity mixing ratio
54 78 kg/m2 - plt Precipitable water
61 78 cm - plt Total precipitation
102 * dm - slp Pressure MSL
129 78 cm - hgt Geopotential height
138 78 s - vrt Vorticity (relative)
102 * cm - slp Pressure MSL
151 * cm - slp Pressure MSL
129 * cm - hgt Geopotential height
132 * m/s y wnd wss Wind v-component
230 * gpm - plt 5-wave geopotential height anomaly
201 * gpm - plt 5-wave geopotential height anomaly
500 78 m/s - wgr Wind
501 * m/s - wgr Shear