Snow Days

I have to admit, I love Snow Days just as much as the students. Unfortunately, there are those days that are borderline and confusing. Days that shouldn't be Snow Days, but half the class doesn't show up because it's drizzly and cold. And days when the university should cancel class, but doesn't, and you end up with a handful of people in class. It really messes up the flow of the course. Especially if you're covering something important and almost no one is there. Do you cancel at that point - when people have gone out of their way to make it to class? Or do you give the important lecture and hope the absent students get the notes from someone? In the future, I think I'm going to cancel class ahead of time, even if the university doesn't. Most of the professors did cancel for today.