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Greetings Brian, I think what you are seeing is the difference between the 12 km grid of the NAM and the 2.5 degree (~250 km) grid of the GFS. If you decimate the 12 km NAM to use every 20th grid point using the spatial subset, then the difference is not too bad. Also, if you use the simple difference formula found on the "Field Selector" tab under "Formulas"->\ "Miscellaneous", the eye-ball average difference is around 10 mb for the central CONUS), but can be as big as ~40 mb near the edge of the grid. Cheers, Sean > I was going to look at differences in my mesoscale class. > But something about these Best time series time levels seems to be totally > wrong. > Complete mismatch. > ? > > Created with the TDS 42. - 4.3 upgrade plugin in case it matters. > > > > [cid:e77ccf04-13ad-4ba0-8ad6-ddfa6b33702b@amazon.rsmas.miami.edu] > > > > Brian Mapes > address@hidden > > > > > Ticket Details =================== Ticket ID: ENB-133694 Department: Support IDV Priority: Normal Status: Open