Snow Rollers are rare and weird weather phenomenon that occur during the winter in many areas but are most commonly seen in hilly or mountainous areas. Often referred to as "nature's natural snowballs", these barrel-sized snowballs occur when strong winds pick up wet snow and blow it along the ground, resulting in a cylinder of snow that it hollow in the middle. When the snow roller becomes too big for the wind to move it, it stops.
According to the National Weather Service, the optimal conditions for snow rollers to form is a layer of ice, then a layer of loose, wet snow accompanied by strong winds and a slope to the ground.
https://weather.com/tv/shows/strangest-weather/video/snow-rollers
https://weather.com/news/weather/news/snow-rollers-idaho
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