For those of us "within range", here are some good ideas from secretsofsurvival.com:
During an Eruption:
Save water in your bath, basin, containers or cylinders at an early stage - supplies may become polluted.
Stay indoors with your pets as much as possible.
Wear mask and goggles if you go outside, to keep volcanic ash out of your eyes and lungs.
Keep gutters and roof clear of heavy deposits of ash, which can collapse the roof.
Take your outdoor clothing off before entering a building - volcanic ash is difficult to get rid of.
Take your Getaway Kit with you if you have to leave. Turn electricity and gas off at the mains. If you turn gas off, have a professional check for leaks in case of damage before turning gas on again.
Keep below ridge lines in hilly terrain - the hills will offer some protection from flying volcanic debris.
DON’T Go sightseeing!
DON’T Leave home unless advised to by the Civil Defense.
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Thanks! I already have most of these covered.
DON'T DRIVE YOUR VEHICLE!
Geologists are saying this is not in any way related to St. Helens.
Nothing happening here, folks. Go back to sleep.
Then, in their very next breath, they say this was the largest event on Mt. Rainier in the last 30+ years or so.