These things are normally true-
1. The initial front end thump of snow is stronger than modeled and puts down at least an inch or 2 more than forecasted.
2. The warm nose sets up somewhere within 30 miles of I 85.
3. Heavier precip could mean sleet and snow while lighter returns yield freezing rain.
4. The snow starts a few hours before and ends a couple hours before models show it.