Weather Report for May 17, 2010

Clear night. Seeing varied greatly during the night, from 1.0 arcsec to worse than 2.0 arcsec. The seeing generally worsened as the night wore on. In addition, the wind worsened from calm to over 30mph by the end of the night in advance of a strong weather system moving into Arizona from the west. Tomorrow night's weather should be interesting and quite atypical of southern Arizona in May.