Although this was mostly a clear night, southern Arizona continues to
have problems getting rid of the wet air mass that has been over the state
all week long. A cold front came through in the afternoon and dropped
some rain on Kitt Peak. By sunset, the sky was mostly clear and remained
clear for the first half of the night. After midnight, fast-moving clouds
formed and dissipated quickly over the mountain hindering several attempts at
photometry. Twenty blazars were successfully observing for polarization and
most will have flux information. The humidity was all over the place during
the night, ranging from 37% to 80%. Likewise, the seeing varied between
1.3 and 3 arcsec.
