National Weather Service – NWS Spokane

http://www.wrh.noaa.gov/otx/photo_gallery/snow_rollers.php

“The snow rollers that he took pictures of are extremely rare because of the unique combination of snow, wind, temperature and moisture needed to create them. They form with light but sticky snow and strong (but not too strong) winds. Some snow rollers are formed by gravity (i.e. rolling down a hill), but in this case, the snow rollers were generated by the wind.” Nature is amazing.

http://www.wrh.noaa.gov/otx/photo_gallery/snow_rollers.php

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