Rare snow rollers have appeared in a yard in Suttons Bay, Michigan, creating a striking display of a weather phenomenon that occurs only under specific conditions. Snow rollers, resembling delicate cinnamon rolls made of snow, are a rare natural occurrence. They form when a light, sticky layer of snow falls on a surface to which it doesn't adhere. Gentle, steady winds then push the snow, rolling it into cylindrical shapes without causing it to break apart.