Weather Report for May 31, 2011

The wind was calm tonight after causing problems during the past several days. However, the night was only truly clear during the first couple of hours. After that, thin to moderately thick cirrus moved in from the southwest. This prevented flux measurements of most objects. Spectropolarimetry was occasionally slowed, but most targets were successfully observed. The seeing was quite respectable, being 1.2-1.5 arcsec.