Smoother?

Is there any way to make the contours over Canada (where data is limited)
smoother? The plot is attached and plotting portion of the script is below.
Michael

wks = gsn_open_wks("ps","obs_climo_map_ann_snowfall_expanded")
setvalues wks
 "wkColorMap" : "rainbow+white"
end setvalues
plot=new(1,graphic)

res = True

res@gsnFrame=False

res@cnLinesOn = False
res@cnFillOn = True
res@cnLineLabelsOn = False

res@mpInlandWaterFillColor = "gray"
res@mpOceanFillColor="gray"
res@mpLandFillColor = -1

res@cnFillDrawOrder="PreDraw"
res@mpFillDrawOrder="Draw"
res@cnLineDrawOrder="PostDraw"

res@sfXArray = lon
res@sfYArray = lat

res@mpMinLatF = 37.
res@mpMaxLatF = 50.
res@mpMinLonF = -97.
res@mpMaxLonF = -70.

res@mpGeophysicalLineColor = 2
res@mpPerimOn = True
res@mpGridLineDashPattern = 2
res@mpOutlineBoundarySets = "AllBoundaries"
res@mpUSStateLineColor = "black"
res@pmTickMarkDisplayMode = "Always"

res@cnLevelSelectionMode = "ExplicitLevels"
res@cnLevels = (/10.,50.,90.,130.,170.,210.,250.,290./)
res@cnFillColors=(/237,200,187,177,238,97,80,47,20/)
res@tiMainString="Obs Snowfall 1980-1999"
plot(0) = gsn_csm_contour_map(wks,snow,res)

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