Yep... I was there! I remember driving south on I-5 about 10 miles south of Tacoma when it blew. The freeway stopped, everyone got out of there cars and just watched it. It was freaky. It was a mess also.. fine dust everywhere and it totally screwed up cars engines with the fine dust blowing in threw the front grill.
I was an awesome site. Me and a couple friends went up there about a year after it happened. Total distruction. The force o fthe blast took Crystal Lake that sat at the foot of the mountian and moved the entire lake 3 miles to a valley over the seconed ridge of mountians. Trees iblown back flat in rows like dominos... mile after mile after mine. No signs of life or growth.
Never seen anything like it in my life.