This morning I noticed large amount of dew on things in my yard, reminding me
of observing sessions that were ruined by severe dew. I'm talking about puddles
of water on my observing table and water dripping off my scope.
So, my question is this: Is there a way to predict dewing from the
Clear-Sky-Charts and other data, say, by comparing transparency, humidity, and
temperature? The air-temperature/dewpoint relationship is not a good indicator
of dewing because radiative cooling from a clear sky can cool objects well
below both the air temperature and dewpoint. It's a good predictor of fog.
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