The night started with a partly cloudy sky and a cold front approaching.
Only four blazars were observed in the first hour and a half before the
dome had to be closed for thicker clouds to pass through. The seeing was
1.7 arcsec. After about three hours, observations started up again and continued until dawn. There were a few periods when thin cirrus clouds had to be tolerated, but the major issue was very poor seeing in the wake of the cold front (2-4 arcsec).
In many respects, it was a fairly lucky night at the Kuiper Telescope. From about midnight on, the observatory on the summit of Mt. Lemmon (only about five miles to the west of Mt. Bigelow) was in a cloud cap.