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I read somewhere that the seeing is getting worse globally because the atmosphere is getting warmer and the difference of temperature between ground level and the stratosphere is increasing convection and makes the whole layers more turbulent. There's less stability between the boundaries. But like the air masses between the poles and mid latitudes. There's no clear limit anymore and incursions of very cold air down into warm aire and vice versa. That's how they got this 35c day and blizzards at -9c in a 24h period in the US in the fall. Very quick exchanges.
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