I was on Charge of Quarters (CQ) Duty at my unit in Panama when the news about the volcanic eruption of Mt St Helens came across the Armed Forces Radio Network. All they said was that the mountain had had a major volcanic eruption, and I heard little new about it for several days.
My family lived in Oregon (and still does) within viewable range of Mt St Helens. We had camped up that mountain several times when I was growing up, and my folks might occasionally still do so back then. I was worried that they may have been affected by it.
I tried for three days to get a phone call in to my folks, but the phone lines were "clogged", which only added to my concern. On the fourth day I finally got through to them and they were fine. They had been camping when it erupted, but they were on Mt Hood at the time and didn't even learn about the Mt St Helens eruption until the day after it happened.
My Dad was in the Oregon Army National Guard at that time. His unit was activated to provide assistance. He has some stories about the ash being difficult to deal with, making it hard to breath, engine air filters clogging, etc…
My Grand Parents in Portland did, on a subsequent eruption, get a little ash on their property. Grandma collected some of it off the property and put in to a little bottle as a souvenir.