ESO WEATHER WATCH: Sky Quality

Satellite based all sky monitoring updated every 3 hours

reliability better than 95%

Sky Quality Conditions from best to worst :

LowPWV--Nominal--HighPWV--VariableExtinction--Clouds---Overcast

<.......photometric ........................><.............................><non photometric>

see A. Erasmus, Marrakech Site 2000 IAU Workshop

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