Weather Report for December 20, 2014

The first night of Campaign 67 begins with a reasonable night of observing at the Bok Telescope on Kitt Peak. Light, scattered cirrus in the sky at sunset moved away from the mountain by the time observations started and photometry could be obtained along with spectropolarimetry. However, by 2200 local time, cirrus moved back over the mountain until around 0300 when the sky cleared again. At times, the clouds briefly halted observations and no photometry could be secured for several blazars. Although the seeing started out at 1.2 arcsec, it was 2-3 arcsec for most of the night. The seeing improved to around 1.5 arcsec during the last three hours of the night. Over 20 blazars were successfully measured for polarization.