Honestly, I know you guys are in the south, but I cannot believe all the school cancellations. We've had a foot in a single night before and still had school the next day. In fact, I don't ever remember closing* for less than a foot (unless temps fall below -25 with wind chill, which is an insta-cancel).
Y'all have plows. We don't, for the most part.
This. I don't really think it's worth it for Southern DOTs to spend tons of money on snow equipment, like massive amounts of salt, *extensive* fleets of plows, etc, and Southern residents to spend money on snow tires, chains, and all the other snow stuff, for something that happens at most two times a year. We've only got a little of that. As a result, the roads will remain slick and icy for a day or two, which means school will be closed, things like buses full of kids on all that ice poses a real safety risk.