NCL cnFillOn strange problem

[stefano04]

Hi,
I'm new on WRF. Today i've finished my first run and all went good. When i try to plot the data, they are displayed only if they are vector or line, but they aren't showed when they are color. I think that is a res@cnFillOn problem or some setting in .hluresfile. I attach here the ncl script, the .hluresfile and the final plot. Sorry for the stupid question but i'm new on this.
View attachment wrf_demo_plot_slp.pdf
.hluresfile
*wkColorMap: BlAqGrYeOrReVi200
*wkBackgroundColor: white
*wkForegroundColor: black
*FuncCode: ~
*TextFuncCode: ~
*Font : helvetica
*wkWidth: 900
*wkHeight: 900

ncl script
begin
a = addfile("wrfout_d01_2020-06-09_15:00:00","r")
slp= wrf_user_getvar(a,"slp",0) ; Sea-level-pressure(hPa)
wks= gsn_open_wks("pdf","wrf_demo_plot_slp")
res = True
res@cnFillOn = True
contour = wrf_contour(a,wks,slp,res)
plot = wrf_map_overlays(a,wks,contour,False,False)
end

 

[stefano04]

I've risolved this problem but i have another question: how can i put on the plot the state and province border? Thank you very much fort the patient but it's the first time for me

 

[abjaye]

This example page has many examples of how to plot borders:

https://www.ncl.ucar.edu/Applications/mapoutlines.shtml