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Hi Paddy,
Personal experience has been that the aerological charts are very helpful to pick a night with steady seeing (or conversely explain why the seeing is terrible) but not much help with regard to transparency. For that the satellite photos of the cloud layers are better, though note this relies on infrared cameras. High clouds are much colder than the land below, so show up well in infrared, but low cloud - especially clouds that are sitting on peaks or worse, ground-level fog - don't show up as they are basically the same temperature as the land.
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