A major cold front moved through the area in the afternoon and Kitt Peak
received some rain. In addition, the temperature quickly dropped below
freezing. The first four-to-five hours of the night were lost to residual
cloud cover behind the front and there were some snow flurries. By
2300 local time, the sky was nearly completely clear and observations
could start. Except for a brief period when some clouds formed and then
quickly dissipated, the sky remained clear and nearly 20 blazar observations were obtained. With the telescope's primary mirror nearly 20 degrees F warmer
than the air temperature when the dome was opened, the seeing was 3-4 arcsec.
The best that the seeing ever got was around 2.5 arcsec. It was not a night suitable for observing exceptionally faint blazars.
