Just seeing this...what a day at work. We are missing a TON of people due to illness.
In my mind, and I'm an overthinker - amounts are a good starting point for sure, but it's only part of my consideration. For example, 8" of wind-driven snow is different than 8" of mid-March paste that is largely gone in 4 hours. So sometimes smaller amounts seem more significant to me than larger amounts do at other times.
I like everyone's input - really, it is our own personal perception. Only thing I'd add to each list is the BECS criteria. For me, that's anything greater than 36". I say this because LNS has never had a storm that large, so that would be of biblical proportions to me.