Weather Report for December 22, 2014

The weather forecast continues to promise clear skies, but an amazing amount of cirrus keeps flowing over Arizona. The cirrus clouds tonight were not as thick as they were last night and work could continue all night long. Nearly 20 blazars were observed through varying amounts of cirrus, with the clouds being less of a problem after midnight than before. Almost no photometry was attempted. The seeing was 1-1.5 arcsec.