Weather Report for April 6, 2011

The night started with plenty of thick cirrus in the sky and only the brightest targets could be observed for the first 3 hours. The sky improved after that, but conditions never became photometric, so little photometry was attempted. Spectropolarimetry was never seriously affected during most of the night except during the first few hours and in the last half hour before morning twilight. The seeing generally stayed around 1.5 arcsec.