Rolling snowballs in Grundsviken-Åre

The day before yeasterday's evening.
This is not on the moon, it's rolling snowballs just outside my house.
It had been a strong wind from North-West during the day, and when I came home I saw this....rolling snowballs. They rolled from South-North direction.....It didn't lean much there. I have no explanation, Maybe someone knows how this coud happen...
Thank You very much !

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