My guests arrived too late for the sunset last night. I kidded them about missing it and that they would have to settle for the sunrise. They were on the terrace watching and then asked, “is that normal?” The answer was no and, looking at a map, I guessed it was Santa Maria erupting. No danger to us as it is way the other side of the Atitlan basin but an impressive looking plume rising way above the mountains on the other side of the lake.
I just found the eruption information. You can read it, in Spanish, here.