Weather Report for April 25, 2012

With last night's problems being remedied by the day crew both on the mountain and downtown (thanks guys), the program moved back to spectropolarimetry now that objects could again be placed in narrow slits. As can be seen in the satellite image, tonight was a race to do as many targets as possible before the advance cirrus clouds of a powerful Pacific storm system reached Mt. Bigelow. Observations were not seriously affected by clouds until the very last hour of the night. Seeing varied between 1.2 and 2 arcsec, with most of the good seeing occurring during the second half of the night. Tomorrow night promises to be a cloudy affair with possibly some rain showers late.