Closing schools seems like a ludicrous overreaction, but actually it's pretty sensible. On the one hand it reduces pressure on the buses and the roads in general. On the other there is also the chance (admittedly more so in rural areas) that conditions could worsen and the kids wouldn't be able to get home and would have to stay at school overnight. This happened at my old school (albeit after I left) and it sounded like a bloody nightmare for all concerned. And, of course, teachers don't always live in the catchment areas of the school (can't afford to if it's a good one) so they'd be short-staffed as well.
But, hey, ho, as long as it allows you to hand in something late without incurring a penalty, then that's ok.