Thanks Wavytone. You discussion about cliff-edges makes we wonder about my local circumstances. I'm on the coast, to the east of an east-facing escarpment. I've long thought that westerly winds produce turbulence as they come over the escarpment. Does that match with your experience? Also, I've tried observing from the communications towers on Maddens Plains, about 50m from the cliff edge and it never seemed to be a good site. Could turbulence generated at the cliff edge affect seeing upwind?
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