A large amount of cirrus had to be endured during the first 2-3 hours of the
night. Another formidable patch of clouds passed over the observatory for
about an hour at 0200 local time. Observations could still be made
during these periods. In between the major cloud events, the sky was in
pretty good shape. In fact, the last three hours of the night were completely
clear. The seeing was quite stable at around 1.5 arcsec.