Dome Observatories - Roll-Off Roof Observatories - DomeObservatory.com. Mason Neck State Park Clear Sky Chart. It's the astronomer's forecast. At a glance, it shows when it will be cloudy or clear for up to the next two days. It's a prediction of when Mason Neck State Park, VA, will have good weather for astronomical observing. The data comes from a forecast model developed by Allan Rahill of the Canadian Meteorological Center. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers. But they have 763 forecast maps. It can be a chore to find the one you want. So, I (Attilla Danko) wrote a script to generate the images like the one above which summarizes CMC's forecast images just for Mason Neck State Park and the surroundings out to about 10 miles.
There are charts for 4699 locations. Summary: In the rows labeled "sky conditions", find a column of blue blocks. Details: Read the image from left to right. The line, labeled Cloud Cover forecasts total cloud cover. CMC's text page explaining this forecast is here. This forecasts temperatures near the ground. Land Sea and Sky. Orion Telescopes: Save on Telescopes & Binoculars! - Telescope.com. Tele Vue Optics. Meade Telescopes, Celestron Telescopes and Telescope Accessories - OPT Telescopes. Astromart. Cloudy Nights.