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