it most likely will not blow but it does. Say good bye. Yellowstone is measured 2,5090 times more powerful than St. Helens and would most likey place molten lava over 20,000+ square miles of land. St Helens is not even in the same category as Yellowstone, Toba, Taupo, Black Tail etc. Yellowstone is a VEI 8 (mega-colossal) where Helens is a VEI 5 (large). If you surve the initial firebombs, earthquakes and lava, then you will have about 200 300 feet of ash to look forward to.