At a glance it shows when it will be cloudy or clear for up to the next two days, specifically tailored for astronomical observing at Jenny Jump State Forest. The forecast data comes from the Canadian Meteorological Center, whose numerical weather forecasts are uniquely designed with astronomers in mind. Attilla Danko wrote the script that generates the summary image above from CMC's forecast data for our location. The Clear Sky Clock is brought to you courtesy of Attilla Danko and the Canadian Meteorological Center.