I have a very vague memory or a movie I saw as a kid. I must have watched it in the 90s but it could have been a movie from 70s to 90s.

I don't remember which part happened when but I'll try my best. I didn't watch he whole movie either just a few scenes. It was with this woman and her son in a winter setting and it was like no matter where they went something totally bizarre and scary was happening. They went to a middle school or high school and all the kids looked either possessed or demonic or ghosts I forget but they wanted to hurt the woman and her son so they drive away and run then she is driving and to her right she sees a guy standing in the snow and he suddenly falls through. I think she investigates and there is a facility underground and there are a bunch of people fighting this machine/alien not really sure what. Like I said very bizarre but I would love to find out what it is called