Normally in Japanese, we say 「雪が降る」 (ゆきがふる) to express that white stuff is falling from the heavens. 「小雪」(こゆき), literally "small snow," apparently means "flurries."
And 舞う (まう), which means "to dance," can be somewhat poetically applied here. You can picture it, can't you? A beautiful little snowflake, dancing its way down from the sky. I was told that 「舞う」can also be used to describe falling flower blossoms. Elegant, huh?
|This GIF doesn't particularly apply, but I like the Peanuts, so.|