The map overlays provide the most powerful features in Astrospheric. These data layers can be used to find clear locations as well as understand larger atmospheric trends happening near you. While a detailed forecast may show clear skies, it's best to check the map to understand other atmospheric paterns.

Learn more about changing the forecast location

Each layer can be controlled from its custom layer control.

Some layers (such as Transparency) have additional filters to select other relevant data layers.

• If your detailed forecast shows good conditions, check Clouds, Seeing, and Transparency overlays to ensure your location is not in small pocket of good conditions. You want to observe in larger areas of good conditions to remove variability.
• The summers on the West Coast mean forest fires. While the transparency forecast already has smoke integrated in, it is a good idea to look at the smoke layer (a filter under Transparency) as well. Aerosol optical depth data forecasts pollutants which will diminish light from penetrating through the atmosphere.
• Spot check the cloud forecast by pulling up the Satellite views. If the Satellite image differs greatly from the cloud forecast at the same time, then the forecast may not be accurate.
• The Jetstream data layer extends out further than the 48 hour seeing forecast. While the Jetstream isn't the only factor in seeing conditions, it is impactful. Viewing where the Jetstream is going can give you an indication of seeing conditions further out in time.