[coconutt2000]

Given the scale of previous eruptions, you'd need to cross off the entire western half of the U.S. In the unlikely event that Yellowstone explodes, it wouldn't matter much whether you were in the park or 350 miles away.

It's a good thing I live 10,000 miles away in the South Pacific... Hmm, the resulting tsunami might be a problem though.

[gleeaikin]

I am not sure the danger is to the far west, but rather in general to the east of Yellowstone if that is the way the prevailing wind is blowing. When Mt. St. Helens blew, aside from the surrounding 15 or 20 miles most of the ash fall was east of the mountain.

Yellowstone has had 3 major blowouts over the past 2 million years. The most recent one was not the worst. Does anyone know whether the most recent Yellowstone or Toba was worse? Toba left a caldera about 18 by 65 miles. I seem to recall that Yellowstone’s most recent may be about 30 by 50 miles.