Hi Lester,
The jetstream can put a real downer on imaging, for sure.
The last couple of times that I have imaged, the GFS charts have looked pretty crook but the seeing has not been to bad.
Not sure about how reliable they are, I suppose if it is clear than it is always worth a try to get some data, regardless of the jetstream predictions.
With Jup I always go with 45 sec's per channel. I reckon it takes about 10 sec's for me to rotate my manual filter wheel, so I get my 3 channels in under 3 min's.
Cheers
Trevor
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