If there is a storm coming no one is allowed to take off. If you already have vacation scheduled then it’s fine. We have to come in even if the governor declares a state of emergency and orders everyone off the road. I hate working in snow more than anything.
As long as you have vacation time, or can make it up later in the week, they aren’t too picky about your schedule. In rare cases when it has been really bad, and maybe 15 out of 70 show up, they usually will order bunch of pizza. I don’t think my job has actually ever closed.