Weather Report for November 13, 2012

The night started out with the sky covered by heavy cirrus. This slowly thinned out during the first half of the night. Polarimetry of brighter blazars could still be accomplished, but was slowed and little spectrophotometry could be attempted. By midnight, the sky had largely cleared and by 0300 local time conditions were photometric. The seeing was generally around 2 arcsec and a little worse until the last four hours when it improved to better than 1.5 arcsec. As with the previous night, well over a dozen blazars were observed.