The night almost perfectly fit between two fast-moving cloud systems, but not quite. The sky was very clear for most of the night with only a few wisps of very light cirrus that the moon lit up, or they never would have been noticed. Plenty of photometry could be done along with the spectropolarimetry until just before 0300 local time when thick cirrus moved in from the west and slowed operations. In fact, nothing could be observed during the last half hour of the night. The seeing started out at worse than 2 arcsec, but by midnight it was usually around 1 arcsec.
The weather forecast has the clouds easily winning the coming night.