wrf_contour - interpolation of missing values?

Dear All,

I am trying to plot 850 hPa temperatures from WRF output, using wrf_user_intrp3d and wrf_contour. My problem is, at grid points where terrain is high (~ >1500 m), 850 hPa temperature values are obviously "missing", and are not contoured. Is there a not-so-long way or a function to interpolate these missing values horizontally, in order to make the contour plot look 'continuous' ?

My output map (Turkey) is attached.

Thanks in advance,

Ozan

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