I was in Anchorage in the summer of '92 when Mt. Spurr erupted and sent millons of tons of ash into the atmosphere, and the wind brought it directly into downtown.
I recall walking over to the windows at a shopping mall, seeing this black wall approaching, in the middle of the day, it was rather unnerving. Walked outside just as it hit - it was eerily silent out and then BIG ash flakes (think of really heavy snowfall) started accumulating on the ground.
To make things worse, as people drove through it, it got kicked up even more... there was around 4 inches everywhere (and we were camping too.... yuck) and you couldn't find a dust mask anywhere...
we left the next day for Valdez, where they only had a dusting of ash.
<img src="http://volcanoes.usgs.gov/Imgs/Jpg/Spurr/dds39_018_M.jpg">
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