These clouds known as Undulatus asperatus clouds, they can be stunning in appearance, unusual in occurrence, are relatively unstudied, and have even been suggested as a new type of cloud. Witta Priester
Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not seem to be harbingers of meteorological doom. Whereas most low cloud decks are flat bottomed, asperatus clouds seem to have significant vertical structure underneath.
Undulatus asperatus is a cloud formation, proposed in 2009 as a separate cloud classification by the founder of the Cloud Appreciation Society. If successful it will be the first cloud formation added since cirrus intortus in 1951 to the International Cloud Atlas of the World Meteorological Organization. The name translates about as “roughened or agitated waves”.