If you haven't already checked it out, have a listen at Off Grid Survival about the big snow storm that hit Ontario and Michigan. There's an interview there with one fellow who was stuck in his truck over 24 hours, all he had was a blanket, and he'd started his trip with only a quarter tank of gas in his truck.
I have two words for you: Car Kit. Brandon Junkin mentions in the interview that by midnight, he was unable to open his vehicle doors because the snow had drifted in so deep. My friends, he is one lucky hombre to be able to tell his story. But think how much better off he would have been with a survival mindset. One thing I will bet on: Brandon is probably going to put together a car kit, and he'll probably listen to weather warnings in the future.
The one item that Off Grid Survival's recommended car kit list doesn't mention is personal sanitation. If you can't open the vehicle doors, you can't step out for a potty break. And for the ladies, a bottle is not going to do it. For the car, when you can't step out, a plastic bed pan or a portable urinal may be just the ticket.
You may also want to consider some waterproof bed-pads if there are children with you.
This would also be useful if you have your dog with you. If it's not safe for you to step out, it certainly is not safe for Rover to do so either.
Finally, if you have your car kit in the trunk of your car, you may want to think about putting it in the back seat if you set out on a trip and the weather is iffy. Your kit won't be of any benefit if you can't get it out of the trunk because the snow is so high that you can't open the doors.
December 15, 2010: Looks like 327 people were rescued altogether. Reports indicate many were not dressed for the weather, and some were stranded for almost 24 hours. Check it out: