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Clouds and Climate Confusion. Clear Sky Chart Homepage. What is it? It's the astronomers forecast. It shows at a glance when, in the next 48 hours, we might expect clear and dark skies for one specific observing site. There are many, but the example above is for Texas Star Party (the most sponsored chart). It's is specifically intended for amateur astronomers. The data comes a forecast model developed by Allan Rahill of the Canadian Meteorological Center. Read from left to right. If you find this image, or the underlying forecast maps, useful please email Allan Rahill. Are there Charts for other locations? Yes, thousands. May I get my own Chart? If you observe at a site more than 24km or 15 miles from an existing chart site, feel free to request a chart for it. I can generate charts for almost anywhere in Canada and US.

To ask for a CSC, email me with: Latitude and longitude accurate to at least 0.01 degree or 1 arcminute. I reserve the right to offer you a different chart that is still close enough to give maximally accurate forecasts. Little Bennett Regional 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 Little Bennett Regional Park, MD, 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. So, I (Attilla Danko) wrote a script to generate the images like the one above which summarizes CMC's forecast images just for Little Bennett Regional 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. The line, labeled Transparency, forecasts the transparency of the air.

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