"Worst case is the Yellowstone Caldera goes boom. We are outside of the historical ash zone for that but the civil disruption from that event would be huge."

You're not out of the ash zone. It just depends on how large the eruption is. When Mt. Pinatubo in the Philippines erupted in 1991, the main blast ejected more than one cubic mile of ash and debris. Fine ash fell as far away as the Indian Ocean. More ash was produced in the following eruptions. The ash clouds were tracked several times around the Earth by satellite.

About 20 million tons of sulfur dioxide were injected into the stratosphere, and this affected the global weather through 1993.

Personally, I think our Mt. Rainier will blow long before Yellowstone does, but what do I know? Practically nothing.

The Bruneau-Jarbidge event in southern Idaho (10-12 million yrs ago) dropped ash to the depth of a foot 1,000 miles away in northeastern Nebraska.

On the rare chance that Yellowstone did erupt, the ash would probably be a monumental problem for you. One foot of ash comes down like powder, lighter than snowflakes. And then it rains and retains all that moisture, and becomes like concrete. If not removed from your roof when it's still dry, it WILL collapse your house. Wearing respiratory protection, use snow shovels or large brooms, slowly push it if you can, as you can't shovel it very well because it becomes airborne.

Keep your fingers crossed that it never happens.

Sue