Thin cirrus marred the sky for most of the night, though heavier clouds
fortunately slid by to the north.
A good night, but it remains to be seen how much
differential photometry will be valid. Spectropolarimetry wasn't significantly
slowed by the thin clouds. The seeing was the best so far this campaign,
hovering around 1.5 arcsec for the entire night.
It was a very warm night in keeping with the fact that Tucson reached
100F for the first time this year in the early afternoon. Summer has
officially begun since the "ice" has now cracked on the Santa Cruz river!
