For those who don’t follow this stuff, that is a map of ash fields from 4 different volcanic eruptions. Three are from Yellowstone, and one is from Long Valley, CA.
Those of us who live in the general Yellowstone area- I'm actually closer to Devil's Tower and Mt Rushmore, but close enough- tend to be among those who do follow tis stuff. And, of course, Mr. Murphy's second law also applies: If it can go wrong, it will go wrong...at the worst possible time.