Help with NAM model

[Walsh, Brian J]

Hi,
 
I have an interesting problem with the NAM model (12 km resolution).
When I download the grib files and process them, the values I get for
the categorical precipitation types are rarely 0 or 1 (yes or no).  I'm
just wondering how other people that download and extract data for the
NAM model deal with this issue; I've heard of doing linear
interpolations or only extracting data for a sub-region, but I'm not
sure if either will work.
 
Thanks in advance.
 
Brian


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