I took the photo the other evening at dusk. Ever since I saw the first pictures of asperatus clouds, I've watched the sky, hoping to see the formations. The clouds in the picture are not as dramatic as some pictures I've seen, but I believe they may qualify as asperatus.
Asperatus clouds resemble waves in the sea. The clouds do not produce storms, but they tend to form near thunderstorm clouds. On the left in the photo near the tree is the top of a thunderstorm cloud.
Undulatus asperatus (or alternately, asperatus) is a cloud formation, proposed in 2009 as a separate cloud classification by the founder of the Cloud Appreciation Society.
The clouds are most closely related to undulatus clouds. Although they appear dark and storm-like, they tend to dissipate without a storm forming.
As of June 2009 the Royal Meteorological Society is gathering evidence of the type of weather patterns in which undulatus asperatus clouds appear, so as to study how they form and decide whether they are distinct from other undulatus clouds.