No need to imagine chaos if one is prepared. I've been practicing my Volcanic Eruption Reaction Drill for the day Yellowstone blows. You would do well to lay in a few extra shovels and a 6 pack of dust masks at the homestead.
From what I've watched on the Discovery Channel...I will be incinerated within an hour of blowing up and that goes eastward ...so that said: you easterners can kiss my ash....