This was an interesting night of weather. The night started out with mostly
clear skies, but we had to stop observing for about an hour at 2200 local
time for clouds forming over Kitt Peak. When they cleared off, the sky
was photometric for the rest of the night. After midnight, the humidity came
close to forcing another dome closure, but then backed off of the 90%
limit. The night ended with the temperature being 20 degrees F lower than
at the start of the previous night. The temperature difference produced poor
seeing (2-3 arcsec) throughout the night. Despite these issues, it was a productive night of observing gamma-ray-bright blazars.