3 to 6 is a good conservative guess right now if you kick out the Nam from the thought process. Most guidance is around 3.3 for the minimum to around 7 for the max from west to east across the metro. So if you want to cover for the higher potential.. THe absolute max I'd go would be 5 to 10.... With a more reasonable 4 to 8 for the metro area.
Down toward Hampton roads its a whole different animal. They will get more precipitation total obviously, but it depends on how much and IF they mix with sleet or freezing rain down there. Their upside is higher.. but with the added risk of loosing totals to mix.
6 to 12 seems good down there.. 6 if you mix to much.. 12 if you stay snow.