[r9etb]

Hexagons are a pretty "parsimonious" shape -- they appear in nature a lot, as they provide the optimal "packing" arrangement.

I wouldn't be at all surprised to learn that we're seeing the intersection between a series of longitudinally distributed high-latitude cyclonic disturbances caused by something like shear effects between atmostpheric layers, or something like that.

[UCANSEE2]

The answer, my friend, is blowing in the wind.