Weather Report for July 21, 2014

The first 2-3 hours of the night were very good, with clear skies and seeing of 1-1.5 arcsec. By 2300 local time, cirrus clouds from a major thunderstorm complex to the southeast in Mexico moved west over Kitt Peak. The remainder of the night was spent observing bright blazars through varying amounts of cirrus. Operations had to be halted a few times and progress was very slow. By the end of the night, around ten targets were successfully measured for polarization. Some photometry was obtained mostly at the beginning of the night.