We are on the way from WA State to Charlotte, NC and are currently in Butte, MT. It started to snow the other day and caught us with a whiteout when we thought we could get away with hitting a few mild bands of snow (dumb, I know). I am getting some winter tires put on the car tomorrow (a RWD) which currently has all seasons and does terrible in the snow. Our choice is to go down I 15 or take I 90. We'd like to avoid as much snow and ice on the road as possible and will only be driving during the warmest daylight hours 11am-4pm or so. The temps are supposed to be good (40 degrees). Can you give us some advice or suggest other routes? We are in no real hurry, we have even thought about turning around, but managed to leave before the coronavirus spread in force and don't want to go back to our home, one of the hardest hit areas in the country so far. Thanks everyone!