He was the only person on the summit, ~90 miles from #MountStHelens...
Tired after a night of observing billion-year-old stars, he went back to sleep.
Years later, he told me he dreamed about the end of the world. #MSH40
Anyway, back to sleep for the tired astronomer...
The telescopes atop Mauna Kea share Hawaii's Big Island with Volcanoes National Park and occasionally run into complications. The most common culprit is "vog", aka volcanic smog.
This means lower humidity tolerances for opening the telescopes they don't get little acidic droplets on the mirrors...
He was greeted with thick, inky pitch-black air that had what he later described as a "fire-and-brimstone" smell.
Even with a flashlight he couldn't see more than 10 feet.
This sent the ash right over Manastash Ridge Observatory...and, as a result, right over Doug. #MSH40
Doug's first thought was that he was now in the aftermath of some sort of nuclear attack.
As the only observer on the mountain, Doug knew he had a couple important jobs at this point.
This log entry is why one chapter of the book is titled "Hours Lost: Six. Reason: Volcano."