The night started with irritating mid-level clouds all over the sky. Typical of July, the clouds formed and dissipated in a random way (the true monsoon is not far off). Observations were made during these pretty poor conditions until after midnight. Then, the sky cleared pretty well for a couple of hours, but another batch of clouds made things difficult for the remainder of the night. Seeing was 2-3 arcsec during much of the first half of the night and then improved to better than about 1.5 arcsec, with periods of 1.0 arcsec.
The replacement guider system worked well and spectropolarimetry was obtained all night.