When I was in college at North Carolina State University, I was told a great forecaster is one who goes back AFTER a weather event is over...and asks himself, what could I have done differently or what more could I have looked at...and at what angle...to have improved the forecast?
Well, if you look at the ACTUAL data from McGhee Tyson Airport yesterday, Knoxville received 0.24" of liquid, when only SNOW was being reported.
IF we were just 3° COLDER on Thursday during that time, we would have received roughly 2.4" of SNOW in Knoxville, rather than 0.7" of SNOW that was reported.
Take Fairfield Glade, Cumberland County (Plateau), for example, they got 3.0" of SNOW on Thursday. It's no surprise to me because the Plateau is usually 3° to 5° COLDER than the Valley on any given day.
Hope this helps.