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libutron:

Asperatus Clouds
Known informally 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.
Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not appear to be harbingers of meteorological doom.
Reference: [1]
Photo credit: ©Witta Priester | Locality: Hanmer Springs, Canterbury, New Zealand

libutron:

Asperatus Clouds

Known informally 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.

Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not appear to be harbingers of meteorological doom.

Reference: [1]

Photo credit: ©Witta Priester | Locality: Hanmer Springs, Canterbury, New Zealand