I was living in St. John, Washington at the time working for a farm co--op. A farmer had just called me at home and ask if I would consider opening up the warehouse as he was spraying his crops for weeds and had ran out of chemicals. I went to the plant and we loaded the chemicals in his truck. As we closed the doors we notice a huge black cloud covering the whole sky coming from the west.
We had no idea what was happening and a few minutes later it was so dark that the street lights in town came on. We thought the world was coming to an end!!
By morning we had several inches of ash on the ground. Ended up shoveling the roof of our house off and loading several 1500 to 2000 gallon water tanks with pumps on farmers trucks to hose off lawns, streets etc. It was a mess!!
Some of the scab rock country that doesn't get farmed still has traces of ash to this day.