The lower Snow Totals in the Valley are quite possibly due to the average difference in occurences ingested into the Model's. I.e,. say, Kingsport got 1 inch the last 3 Snowfalls while Knoxville got 2 , the Models over time will show Knoxville getting more in their output. Of course, if any wind is forecast, downsloping will be as well. The City to City Avgs may well be factored in now . That I don't know.