Quote: In addition to the above, local conditions from micro (your lawn vs. your driveway) to meso (city? country? lake nearby? e.g.) to macro (lee of ocean breeze, mountain ranges etc.) all play a part.
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Quote:Lots of interesting information here. And lots of generalizations.The jet stream moves from nearly 60 degrees latitude to 20 degrees. It isn't 'over' one particular latitude range constantly at all. It may be slightly more frequent further north than more southern climes.My experience in the Great Lakes region is that air masses and the fronts associated with them have a lot to do with seeing (and transparency which isn't a part of this discussion).If a strong cold front blows through, the high pressure, cooler air mass behind it (first night after) usually has excellent transparency and terrible seeing. The air is turbulent but cooler and drier. The jet stream is often south of us or over us. If the high pressure zone lasts a second and third night the seeing often improves greatly but at the expense of some transparency.Warm, humid, sub tropical air masses (we get these in June - Sept. here) from the Gulf of Mexico region can often have the very best seeing while water is dripping from every surface. In this situation the jet stream is well north of us.In addition to the above, local conditions from micro (your lawn vs. your driveway) to meso (city? country? lake nearby? e.g.) to macro (lee of ocean breeze, mountain ranges etc.) all play a part.A complex subject where the best answer is often, "It depends."Dave
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Quote: ...."it depends" on the specific nature of the question.