It was a nice clear day
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This afternoon, I got an email that there was going to be a launch of a Delta IV rocket from Vandenburg at 13:10:30 PST. I got this about five minutes before the fact, so I had just enough time to go across the street and up on the roof of the Seismo Lab. I wasn’t sure if it was going to be visible from Pasadena, since it’s quite far away, but it was. I could see the trail from the first stage very clearly. The first stage is powered by liquid hydrogen and liquid oxygen, so I guess the trail was just a very large vapor trail. It was impressive that it was visible this far away.
