Weather Report for July 19, 2015

Arizona is still in the tight grip of the monsoon, however, a fairly substantial sucker hole appeared in the cloud cover at about 0300 local time. Spectropolarimetric measurements of four blazars were made before more clouds ended this very short night near the start of morning twilight. The seeing varied between 1.2-3.5 arcsec. For those keeping score: Monsoon 4 - Observer 2.