A fast moving storm dumped over an inch of snow on Kitt Peak in the middle
of the day.
By nightfall, skies were partly cloudy and high humidity prevented
observing for about 1.5 hours.
Observations began in non-photometric skies at about 2100 local time.
High humidity again forced a dome closure at 2300.
Observing resumed after 2 hours, as the humidity dropped sharply.
By this time, the sky was clear and good progress was made in the
monitoring program until dawn.
The seeing in the early portion of the night was poor (2-2.5 arcsec), but
improved to around 1.5 arcsec during the last few hours.