Has anyone ever tried to devise an official Snow Disappointment Index? It seems like it could be done.
Maybe take the fantasy snow lost divided by the annual average snowfall.
You'd divide by annual average, because heavy snow regions would otherwise dominate based on high potential variability. In a stormy region, you could end up with 30" of fantasy snow, only to see 5" fall, for a loss of 25". But after a winter of several feet of snowfall, you're not really disappointed. In Raleigh, you could get your entire season's average to show up as fantasy snow 24 hours ahead of the event, only to get a trace.
How you define fantasy snow might be tricky, but we could agree on some metric. Maybe an average of the Euro, GFS, and a short range model like the NAM, at some specific point in time before the event.
ETA: it should be net fantasy snow lost. If you overperform, that comes off your totals.