getting a Time variable from NCEP NAM grib2's

I'm a little stumped. We need to subset NAM awip32 data to provide
surface winds (u,v) and pressure. I'm thinking I also need an unlimited
time variable in there. How should I be getting time from the files?
We're using addfiles to read in the entire forecast set, and then
identifying the few parameters we need. I just can't seem to find a
"Time" variable to snag.

Thanks, Gerry

-- 
Gerry Creager -- gerry.creager_at_tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.862.3982 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
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