Weather Report for January 12, 2013

Happy New Year! The first Fermi/Steward Observatory monitoring campaign of 2013 starts with a decent, but very cold night on Kitt Peak at the Bok Telescope. The major weather action occurred during the previous night, when a serious cold front swept through Arizona, bringing high winds and some snow to the mountain. As a result, the primary mirror was nearly 10 deg F warmer than the air temperature at the start of the night, leading to seeing of around 3 arcsec. By midnight the seeing had improved to about 2 arcsec. Despite the less than great seeing, this was a very productive night both in terms of spectropolarimetry and spectrophotometry.