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My experience is this. Nights of great seeing typically precede a cold front moving in from the West. The warm air rises up over the top of the cold front. Seeing is especially good when the night is still and a little humid during late summer. All my best imaging efforts this year have been late summer on still humid nights just before cold front passes.
Local topography also influences seeing. If you are in zone like I am just behind a hills range with the prevailing wind rushing up onto those hills, the seeing will be less than perfect most of the year, too much turbulence. Only on nights when the wind is going the other direction will the seeing be at least average.
Good studies to read are those by damien peach. Worth looking at. They helped me predict nights of good seeing with some certainty. The image that Davo submitted shows my point very well. That huge cloud bank was a cold front moving through underneath a High that was centred over Tassie.
Anyway, that's about good as it gets for me. Should have done meteorology at Uni instead.
Paul
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