Wildfire smoke will be the big question there. It's started to be bad for a week or two a year in Minneapolis, and is only worse the closer you are to the boreal forest.
Given it took FEMA ten days to get power restored to the super dome, how long will responses be when there are many simultaneous disasters of that size or bigger? With the current admin the answer could be “indefinite”
Eventually only desert remains viable, and everything above it, including arability, is locked away forever.
Excess rainfall creates an explosion of brush that during the now annual drought turns to tinder.