Missing values in PyNIO

I'm using PyNGL/PyNIO to process data from an ascii file
format into NetCDF.

How do I set _FillValue / missing_value on a variable and
ensure that the variable is pre-filled with that value?
 From the documentation, it seems like most of that happens
automatically, but my resulting NetCDF files don't have a
_FillValue defined, and "data._FillValue = -999" generates
the error message:

 ncendef: ncid 65536: NetCDF: Not a valid data type or
_FillValue type mismatch

Help? Thanks!

--Seth

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Seth McGinnis
Associate Scientist
ISSE / NCAR
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