"...These must have formed on Friday night, before the really cold air came in. Temperatures were still above freezing, and the snow was a little sticky, and then the winds picked up. He said there were thousands of them spread out over a number of fields.
Most of these were about 6-8" in diameter, and about 4" wide. But sometimes these snowrollers can be bigger than that. In some of these photos you can see the tracks made by them as they are rolling up, but the winds will sometimes cover the tracks making them hard to see. "