What's this about Yellowstone again?
Ok, I just searched and this site(took the site out because yeah, it was a little kooky, just Google 'Yellowstone Volcano') came up first on a Google search and it might be a little out there as far as the potential weirdo that made it but yeah. . .
When I was in grade school in the late 80's and early 90's some studies into Yellowstone has put fourth the theory that underneath it is the biggest volcano known to man, if it goes it will be the biggest eruption that has been on this planet since man has been on it, not since recorded history, but pretty much since mammals appeared. It has the potential to block out the sun for hundreds of years. Even with that the most scary part is whenever there is volcano or earthquake activity
anywhere in the world there is a spike in activity in Yellowstone. Nothing big yet, but when I was a kid park rangers would tell tourists that but now they kinda don't want to say that since it scares people off from visiting a second time.
If you go there it is beautiful, one of the most beautiful places on earth, but when you are walking around the hot pots and watching a glass of water ripple when you're within 20 miles of said hot pots you realize that yeah, there is a lot of pent up power there. Mount St. Helens is closely related to Yellowstone, in fact it was that volcano that started the real study of the possible danger of Yellowstone. It is said that if Mount St. Helens didn't blow then Yellowstone would have.
These things are hard to predict though and there are a lot of data that says Yellowstone won't go for a long time so I wouldn't base my life around it. No matter where you go though you can't escape it, well, short of getting off the planet, it will be a global catastrophe, mainly affecting food crops and causing starvation since it will block out the sun.
I however do not study this for a living and this is stuff I leaned in grade school, like 20 years ago, maybe it has all been proven wrong now. Reading elsewhere I am wrong about not erupting since mammals appeared, but the last time it erupted it caused mass extinctions.