SMCAS

The Clear Sky Clock shows forecasts for astronomers. They detail Cloud Cover,  Transparency and Seeing.  The predictions are hour by hour and provide data not available anywhere else.

For a larger view and more information click on the chart.

CSM's Observatory in San Mateo Ca.

Chanan Greenberg's Observatory in  Sunnyvale Ca. 

Richard Bennion's Observatory in Belmont Ca.