Weather Report for June 12, 2010

As with the previous night, substantial cloud cover cleared off at sunset and the entire night was clear. Winds were strong from the southwest, sometimes gusting to 30 mph. Temperatures are running 10-15 degrees F cooler than normal for this time of year. This unseasonable weather is caused by a massive storm to the north of Arizona. In fact, lightning could be seen on the northern horizon during the first few hours of the night. Seeing was poor, running between 1.5-2.5 arcsec. Some of the poor image quality is undoubtedly caused by the wind shaking the telescope when the dome was pointed to the south and west.