[cogitator]

The winds blow across the valley, pick up sand, and then drop it as they are funnelled to the low spot and lifted upwards.

I was there in the winter (it was probably in the 50s) and went for a hike in the dunes. I had to beg some fellow hikers for some lip balm before my lips cracked off in the cool, strong, and extremely dry wind.

[Lil'freeper]

I've been there, and to Coral Pink dunes in UT.

'Body sledding' down them is a riot.