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Bill, I did some investigating into the CONUS_12, CONUS_20km NOAA PORT and conduit, and CONUS_40km conduit models. All the models above except the CONUS_20km NOAA PORT have the product definition type as Analysis/Forecast at the Horizontal level layer. The CONUS_20km NOAA PORT has the product definition type as Accumulation. So part of the problem as you mention is Snow Depth definition depends on what model you are inspecting. Most of the Snow Depth data ranges were .005 - .09 because the units are meters. The CONUS_12km model had range .15 - 2.5 for the product that I decoded. Those values seem high to me, so I did a low level dump of the data and those were the correct values. Could you verify your finding with NCEP on their web site? Also, could you make available a test file or tell me what one that is known incorrect so I can verify my findings. I did notice that it seems that some of the conduit models are the ones with the high values. There is definitely a problem but at this time, I don't know where it is. Thanks, Robb... Ticket Details =================== Ticket ID: BVH-378201 Department: Support THREDDS Priority: Critical Status: Open