begin fu = addfile("$NCARG_ROOT/lib/ncarg/data/cdf/Ustorm.cdf","r") fv = addfile("$NCARG_ROOT/lib/ncarg/data/cdf/Vstorm.cdf","r") u = fu->u(0,:,:) ; Select first timestep. v = fv->v(0,:,:) wks = gsn_open_wks("x11","vector_ex03") res = True ; Plot options desired. res@gsnMaximize = True ; Maximize plot in frame. cmap = read_colormap_file("rainbow") res@vcLevelPalette = cmap(16:,:) res@vcMonoLineArrowColor = False ; Turn on color vectors. res@vcRefMagnitudeF = 20 ; Define reference magnitude. res@vcRefLengthF = 0.045 ; Define length of vector reference. plot = gsn_csm_vector(wks,u,v,res) end