question about interpolation

To whom it may concern:

 I am trying to interpolate the lat/lon from NCEP(2.5by 2.5 degree data) to
a certain location(let's say, 38.85N 77.04W), but it seemed it can not do
using rcm2points. The attachment includes the script. It seemed that
rcm2points can interpolate wrf grid for a certain location, but when I
interpolate the NCEP data, it always shows up value like -9.96921e+36.

 Is there any requirement to interpolate using this function?

 I forgot attachment in last email, so I ask again.

Thanks

Yang

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