Astrophotography by Dennis Friedman

What is it?
Created by Attilla Danko, ClearDarkSky is an astronomers forecast. It shows at a glance when, in the next 96 hours, we might expect clear and dark skies for one specific observing site. There are many, but the link is for here us for Winer Observatory Chart which the most sponsored site.

Click Here for My Clear Dark Skies 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. Locate a column of blue blocks. That's when the sky will likely to be clear and dark. A more detailed explanation is here, but the short version is: the clear sky chart predicts hourly cloud cover, atmospheric transparency and seeing. (Good "seeing" occurs when the air is steady enough to allow you to see fine detail on planets through a telescope.) That means you can plan whether to observe galaxies or planets or stay home and process image data.
If you find this image, or the underlying forecast maps, useful please email Allan Rahill. He needs to show his bosses at CMC that his astronomy forecasts are actually being used. Feel free to copy me. If you find the charts very useful and want more frequent updates and more features, consider sponsoring.

Are there Charts for other locations?
Yes, thousands. The coverage area is Canada, USA and parts of Mexico.