Mini Cloud Atlas
Altocumulus Lenticularis (Mountain Wave)
In the lee of the Front Range, these clouds proliferate amidst wintertime's strong westerly flows. As the air rushes over the Rockies, it undulates, forming stacks of standing waves over and in the lee of the mountains. [The cloud code for them is ACSL, altocumulus standing lenticular.] Air rises on one side of a standing wave -- condensing water vapor into laminar, layered formations like this -- and sinks on the other. Photographers take great delight in such lenticulars near high mountains worldwide.
2 NW Broomfield CO (Feb 2) Looking SE