Not to worry?
http://www.usnews.com/blogs/capital-...no-update.html
"While the Discovery channel documentary did a fair job of portraying how an eruption might come down, it also did a better job of whipping up anxiety about a very unlikely event. You would be much more productive hiding in your closet avoiding lightning than worrying about a Yellowstone eruption. It's a wonderful thing to ponder and try to get a grip on some of the wild things that happen on our planet, but not something to stay awake about."