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I went to Adams Grave today and saw something amazing.
There was a bank of mist that stopped in East Field (where all the big crop circles appear.)
As the mist drifted a bump in the field gave the impression of a mist circle.
http://myweb.tiscali.co.uk/stonehenge/AdamsGrave.html
PeteG

Ah the landscape and the elements know you round there, Pete. They like doing weird stuff for you. That's what I think.

PeteG,
Being a bit of a sceptic, I'd say that was a local temperature inversion, where the temperature in the dip was lower than the temperature on the rise in the field, i.e. a "frost" hollow formed, where the significantly cooler air below mixed with the warmer air above to form a fog on the boundary, and the air movement showed it up as a swirling motion.
This is fairly regularly seen on mountains in the autumn/winter months, where, unbelieveably, the temperature at 3,000 feet can be about 6 or 8 degrees above that in the valley. See the link below for the most recent:-
http://www.leaney.org/lake_district_walk.php?walk_id=641
Regards,
TE.