Well guessing what the conditions may or could be is impossible. As Midwest Michael stated you could delay or speed up your departure time. I might suggest you check with a auto parts store or big tire store in your area on a buy and return set of chains if you don't use them. You should be able to mount them on your tires so you know how to do it in your driveway at home, instead of laying in the snow along side I-5 trying to figure them out.