I live in Ogden/Layton Utah. The winter here is the biggest threat; my car is plenty outfitted for that. The big big one is a 7.0 earthquake from Logan to Provo, somewhere in that region. It will be bad. The only scenario I have for that is shelter in place; the only way in or out except through the far south of Utah is through canyon passes, and I'll bet gold against sawdust those will be either closed by rockfall and debris or severely messed up making leaving impossible. Good news is, the local faith promotes "self reliance". The vast majority don't know what that is going to entail when the rubber meets the road, but we'll get to that. So, those are the two scenarios I can think of, barring the apocalypse. (It's kind of funny how this started.)