In this Nov. 24, 2013 photo provided by George Loegering is a large spinning circle of bits of ice t
In this Nov. 24, 2013 photo provided by George Loegering is a large spinning circle of bits of ice that Loegering spotted in North Dakota’s Sheyenne River while out hunting with friends. Members of the National Weather service said a combination of cold, dense air last weekend and an eddy in the river likely caused the disk that Loegering, a retired engineer, calculated to be about 55 feet in diameter. It’s not an unknown phenomenon, but it is relatively rare, said Loegering, who lives in rural Casselton, about 20 miles west of Fargo, N.D. Video of another one here. -- source link
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