Clear Sky Clock

Click here or anywhere on the Clear Sky Clock for more information on the chart with in-depth explanations, links to a local map of light pollution, transparency and seeing forecasts, sun & moon data, and much more...

(The Clear Sky Clock is brought to you courtesy of Attilla Danko and the Canadian Meteorological Center) Thank them!

Current Forecast

Click for Hope, New Jersey Forecast

Clear Sky Chart

The Clear Sky Chart: What is it?

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 Jenny Jump State Forest, NJ, will have good weather for astronomical observing.

The forecast data comes from those very cool guys at 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 Attilla Danko wrote a script to generate the images like the one above which summarizes CMC's forecast images just for Jenny Jump State Forest and the surroundings out to about 10 miles.

Calsky's Current Satellite Map

The following image is generated by from images from five geostationary weather satellites, and centered at your site. The underlaying image of the Earth is from NASA's BMNG MODIS mosaic (Reto Stockli, NASA Earth Observatory) and represents a mean month's views of the Earth surface (hence snow/ice extent is not from today!)

Calsky's Meteogram

Weather forecast for the next days for the current coordinates and an elevation of 304m a.s.l. All weather data is extracted from the numerical GFS weather model and has not been examined by a meteorologist - therefore use without guarantee and under exclusion of liability. Weather forecast is updated every 6 hours.