snowroller
n.— Note: Also as two words: “snow roller.” «Several days ago, several hundred rather large snowballs appeared on Lake Eyak over night. The next day I received phone calls and e-mails from curious Cordovans asking what they were and how they got there. One person thought maybe some high school kids were in the process of making lots of snowmen but never got the snowballs stacked on top of each other. If you got a chance to see this strange phenomenon, you probably noticed they were very similar in size and shape and fairly well dispersed across the northeastern part of the lake. They are called “snowrollers,” and they occur under very specific weather conditions like the ones that occurred overnight.» —“Solving a snow mystery” by Allen Marquette Cordova Times (Alaska) Mar. 20, 2009. (source: Double-Tongued Dictionary)
Further reading
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