Retired engineer George Loegering was out hunting in North Dakota on Saturday when he spotted a huge circle of ice spinning on the Sheyenne River, over 50 feet in diameter .
Allen Schlag, a National Weather Service hydrologist in Bismarck, and
Greg Gust, a weather service meteorologist in Grand Forks, said a combination of cold, dense air and an eddy in the river likely caused the disk.
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The air pressure on Saturday in nearby Fargo was a record high for the city for the month of November, according to Mr Gust.
He said the cold air turned the river water into ice, but since the water was relatively warm it didn not happen all at once. Floating bits of ice got caught in the eddy and started to spin in a circle.
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