The thing that makes it somewhat “dangerous” is the cold tuck accelerates right before that 2nd pulse of precip comes in on Thursday night. So if some areas had warmed up to mid 30s or something like that after the initial snow/sleet, a lot of people will think the worst is over but then all of the sudden it dumps back down to 28 and the next wave of precip is coming in. That’s how it could be especially nasty. GFS actually shows this too at 12z.