Weather Report for July 20, 2012

The sky was almost completely overcast from sunset to after 0100 local time. Observations through varying thicknesses of cirrus started a little after 0100. The sky slowly improved as time wore on and was mostly cloudless by the start of morning twilight. Spectropolarimetric observations of 8 blazars were obtained and even some photometry was attempted on a few late objects. The seeing was exceptional, at 0.9-1.3 arcsec.