jtotheizzoe:

Lenticular and wave clouds are cool, but they don’t hold a candle to the undulatus asperatus clouds. Not new, but new to science, its Latin name means “undulating wave”. it’s like staring up from under the sea, or from beneath an undulating ice formation, except we are seeing a cloud rather than a solid or liquid.

They look ominous, but are rarely stormy. Why they form and what their pattern means? I haven’t been able to find anything. Can you?

(via APOD)