it spied 540 million tons of ash over 11 states, and two canadian provences, and caused more than $3 in damage. it has been declared the most disastrous volcanic eruption in the history of the u.s., and the most shocking thing of all? it was 40 years ago tomorrow. >> i was thinking 20, 25 years. it is shocking. >> i was doing the math to figure out 80 was that long ago. >>> you can see a shower get in the way of our lens. i just want to talk about the rain so far. because it's been like a tail of two different rain makers, depending on where you are. here are the rainfall totals for where a lot of us are, like santa rosa, got a quarter inch of rain. san jose has only gotten .03 of an inch of rain. that is one story of the rain. now i'm going to show you what's happened in the mountains. a totally different story. mount tam has gotten over an inch and a quarter so far. ben lowman, that's the peak up above the community got almost an inch. where the radar sits from the national weather service picked up about an inch. for most of us, it was a quiet day. but it has been a good rain make