weather

This weekend Noah and I are headed to Rockford, Michigan to see my 95 year old grandmother. Allen can't come with us since he has to work on Sunday. My dad was originally coming with us but had to cancel last minute so it is just Noah and I. We fly into Flint and then have to drive 2 hours to Rockford. I just checked the weather and it is supposed to snow every day we are there with a high of only 16 - 20 degrees!! HOLY COLD!!!!!! I am a little nervous driving in the snow/ice that far on a road I have never been on. Well, not never been on it but never driven on it myself. Usually my dad drives while i sleep in the backseat. Yes, even in my adult age i like to sleep in the backseat. But this time I have to be the adult and drive...in the snow...with my child in the car...eeeeek! Luckily Noah has always been a good traveler
(see: Nintento DS). He and I have been lots of places together. So how does one pack for 16 degree weather?? Especially now that you have to pay to check a bag! We are planning on going tubing one day at our favorite tubing spot...it is cheap and they pull you UP the hill so you don't have to walk every time you slide down...AWESOME!!! But that requires LOTS of layers! Suggestions welcome.....