Wilmslow Astro
Astronomy from a Cheshire suburb
What's Going On?
WilmslowAstro Weather
My very own weather station on the observatory!
What's going on?
A page of miscellaneous information: A sky chart for northern England, Lunar phase, northern hemisphere aurora chart, Jupiter and its moons, Saturn and its moons. And more...
Astronomy Forecast for Wilmslow
The cloud work function (CWF) is an integrated measure of the difference between the moist static energy in the cloud and that in the environment (units: J/kg). Generally speaking, it can be viewed as an indicator that if the cloud is likely to grow.
Cloud Cover forecasts average total cloud cover over the entire atmosphere. This forecast may miss very low cloud and afternoon thunderstorms. You can refer to “cloud work function (CWF)” or “lifted index” if you would like to assess the stability of the atmosphere.
The seeing here is a reference to the best possible angular resolution which can be achieved by an optical telescope. Generally the actual seeing is slightly worse than the prediction, due to the contribution of the turbulence near the ground.
The transparency here is an integrated measure of the extinction of sky objects. The extinction is generally caused by the moisture of atmosphere. In this forecast, both moisture and ozone are taken into account, but no industrial pollutants or aerosols.
The instability or lifted index (LI) is the temperature difference between an air parcel lifted adiabatically Tp(p). When the value is positive, the atmosphere (at the respective height) is stable and when the value is negative, the atmosphere is unstable.
The darkness here shows the visual limiting magnitude in zenith.
The wind forecast here shows the average wind direction and speed at a height of 10 meters above the ground. The line points to the direction where the wind is coming from.
Relative humidy at 2m above the ground.