The school I work in is Oldham, I've been told there has been 9 inches of snow overnight. I can't speak for other schools, but how can you have a school full of children if the staff may not be able to get there?
Our school is shut due to a lack of man power to make the site safe for 1200 people between snowfall and -5 ground frosts. Possibly catering supplies are held up depending on where they travel from, when 70% of people on site use the canteen you can't send children to school and possibly not have enough food to feed them?
Schools are very rarely on main roads, so access roads generally are not safe enough for the volumes of traffic to safely enter and exit without the risk of accident and half asleep kids walking out into the roads.
If anything happened to your childrens safety, or they went a day unfed I'm sure you would not be happy about that either.
To reassure you, I am actually working from home planning lessons!