I don't have a plan for a Yellowstone eruption - I figure I'm close enough that it won't matter too much.
But tornadoes, severe snow/rain, some flooding, ice, power outage, things of that nature.
Also hazmat as we have lots of trains and I-80, one of the main east/west interstates, is about 5 miles south of here. You can see everything get hauled down that way.
I've somewhat prepared for civil unrest, but mostly because it's one of the more fun things to prepare for since it involves firearms (and lots of them).