Astronomy Weather Forecast for Guernsey Astronomy Society

Below is the latest cloud cover forecast for your chosen observation location. The forecast shows the cloud coverage expected at various levels in the atmosphere as well as a risk of rain forecast to ensure you keep your equipment dry.

Happy stargazing!

Above is the latest astronomy weather forecast for this location. The data shown is :-

Time: This is the start of the forecast period up to the next one
Total: This is the forecast of total cloud cover at all levels of the atmosphere
Low: This is the forecast of low cloud cover (stratus) below 5,000ft
Med: This is the forecast of middle cloud cover (alto) above 5,000ft and below 20,000ft
High: This is the forecast of high cloud cover (cirrus) above 20,000ft
Temp: This is the forecast dry bulb temperature at 2 metres above ground
Dew: This is the forecast wet bulb temperature (or dew point) at 2 metres above ground
Surface: This is the forecast average windspeed at 10 metres above ground
30,000ft: This is the forecast average windspeed at 30,000ft above ground
AstroIndex: This calculation uses the total cloud cover along with turbulence in the atmosphere and low level wind speed to give an index from 0 to 10 where 0 is worst and 10 is best observing conditions. (experimental)
Transp.: This calculation uses the total amount of water in the atmosphere above your location. It shows the relative humidity in the column of air from 0 to 30,000ft and gives an index from 0 to 10 where 0 is worst and 10 is best seeing conditions.(experimental)
Pickering: This calculation uses the amount of low and mid level turbulence above your location as well as calculating differences in wind speed and temperature at various levels in the atmosphere to show how much distortion the light rays will experience between 0 and 30,000ft and gives an index from 0 to 10 where 0 is worst and 10 is best seeing conditions.(experimental)
RainRisk: This shows the chance of rainfall at your location.
Weather: This is a combination of all elements displayed as a weather icon