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It was an unusually warm night last night as well - the minimum was about 19C. I had the cooling set for 15C when I went to bed, so it was out by a few degrees when I got up at 3am.
This normally isn't too much of a problem, by 4.30am the mirror would be back to ambient and ready to go , but sadly the seeing fell away before then.
That's the thing with larger mirrors - you lose the flexibility to image at the drop of a hat, and end up arranging everything for a specific time and just hope to find good conditions :-)
cheers, Bird
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