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How big was the last event?
How far did ash travel?
How deep were the ash layers?
I remember hearing that when the Jarbridge Caldera blew up here in Idaho it left an ash layer more than a foot thick in Nebraska. These are very powerful events, the geologic equivalent to a powder keg. Mt St. Hellens will seem like a zit popping compared to the past and future eruptions of the Yellowstone Caldera. Needless to say, if Yellowstone goes Idaho will be unlivable for some time. But I am sure that Erope will be fine in the short term. The larger question is the climatic impact of such an eruption, whether it will cause a 'nuclear winter' effect.
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