[gradsusr] Plotting anomaly wind vectors

[Chidzambwa Simba]

May anyone help me with how I can plot monthly anomaly wind vectors for
any given level from a 6hr time step dataset based on a two year
climatology with the following control file; 
 
dset ^pgrbanlensmean_1964_65
index ^pgrb_1964_65.idx
undef 9.999E+20
title pgrb_1964_65
*  produced by grib2ctl v0.9.12.5p45
dtype grib 255
options yrev
ydef 91 linear -90.000000 2
xdef 180 linear 0.000000 2.000000
tdef 2924 linear 00Z01jan1964 6hr
*  z has 24 levels, for prs
zdef 24 levels
1000 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150
100 70 50 30 20 10
vars 26
CAPEsfc  0 157,1,0  ** surface Convective Avail. Pot. Energy [J/kg]
CINsfc  0 156,1,0  ** surface Convective inhibition [J/kg]
CWATclm  0 76,200,0 ** atmos column Cloud water [kg/m^2]
HGTsfc  0 7,1,0  ** surface Geopotential height [gpm]
HGTprs 24 7,100,0 ** (profile) Geopotential height [gpm]
HGTtrp  0 7,7,0 ** tropopause Geopotential height [gpm]
POTsig995   0 13,107,9950 ** sigma=.995  Potential temp. [K]
PRESsfc  0 1,1,0  ** surface Pressure [Pa]
PREStrp  0 1,7,0 ** tropopause Pressure [Pa]
PRMSLmsl  0 2,102,0 ** mean-sea level Pressure reduced to MSL [Pa]
PWATclm  0 54,200,0 ** atmos column Precipitable water [kg/m^2]
RHprs 19 52,100,0 ** (profile) Relative humidity [%]
RHsig995   0 52,107,9950 ** sigma=.995  Relative humidity [%]
SPFHprs 19 51,100,0 ** (profile) Specific humidity [kg/kg]
TMPprs 24 11,100,0 ** (profile) Temp. [K]
TMPsig995   0 11,107,9950 ** sigma=.995  Temp. [K]
TMPtrp  0 11,7,0 ** tropopause Temp. [K]
TOZNEclm  0 10,200,0 ** atmos column Total ozone [Dobson]
UGRDprs 24 33,100,0 ** (profile) u wind [m/s]
UGRDsig995   0 33,107,9950 ** sigma=.995  u wind [m/s]
UGRDtrp  0 33,7,0 ** tropopause u wind [m/s]
VGRDprs 24 34,100,0 ** (profile) v wind [m/s]
VGRDsig995   0 34,107,9950 ** sigma=.995  v wind [m/s]
VGRDtrp  0 34,7,0 ** tropopause v wind [m/s]
VVELprs 19 39,100,0 ** (profile) Pressure vertical velocity [Pa/s]
VVELsig995   0 39,107,9950 ** sigma=.995  Pressure vertical velocity
[Pa/s]
ENDVARS

Simba Chidzambwa
Researcher, Queensland Climate Change Centre of Exellence


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