NCEP data missing values

Hi to all.
I am using NCEP observation data for u850 in NCL version 5.2.0-beta2. It is
not able to accommodate or ignore the missing values (32766) and plotting
these values whenever i plot the spatial pattern on a single time. Please
find attached the figure.
I even set the missing value to -99 and delete the Fill value but still
problem is same.
Can anyone help me how to deal with missing or Fill values in this version?
Thanks.

-- 
Best Regards
Waqar Younas
PhD Candidate
Natural Resources and Environmental Studies (NRES)
University of Northern British Columbia (UNBC)
Canada

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