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I've just been looking at the sky, and the stars are indeed twinkling rapidly, even bright ones.
It was the same last night: excellent transparency, crap seeing.
The jetstream charts say it all. However, there is allegedly a "lull" in the jetstream, due over SEQ somewhere between 12 midnight and 6am, where 200-300mb airspeed should drop to 40 knots or so. Given the otherwise crisp, clean and cloudless sky, it might be worth a session in the wee hours ... as long as you rug up!
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