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Markus,
Laminar flow does form over the a dead flat surface (the sea) so in principle it can over a flat plain too, if you’re on a decent ridge facing into the wind stream and provided it doesn’t have things that will kick up turbulence upwind of the observing site, such as
- lower hills and ridges upwind (this is what spoils the seeing on Siding Spring Mtn)
- sources of strong thermals such as buildings, car parks, large expanses of tar...
Best you can hope for would be a National Park or large expanse of bushland upwind ...
A few clues are available regarding thermals - smoke from a fire or chimney, dust devils, and if they’re low, bear in mind that cumulus clouds form where thermals reach the dew point. On a few je day they often form in lines blown by the wind downwind of whatever on the ground is triggering the thermals. If that’s happening in the late afternoon the seeing will be crap.
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