#undulus asperatus

[tornadoquest]

[unbfacts]

This is natural phenomenon known as Undulus Asperatus(a type of cloud formation)

[opticallyaddicted]

New Cloud Type Discovered: ‘Undulus Asperatus’

Turbulent motions between differing air masses create undulating clouds as seen over rural Kansas in the early morning hours of April 28, 2006.( Bottom two images ) Meteorologists are proposing these clouds be designated as the first new cloud type to be named in over 50 years: Undulus Asperatus.

The ominous-looking clouds have been particularly common in the Plains states of the United States, often during the morning or midday hours following convective thunderstorm activity.  These clouds are not considered a precursor to severe weather, rather appear to form following rain or thunderstorm activity.

[dullandpointless]

Undulus Asperatus clouds over Dingle, co. Kerry, Ireland

[san-fran-cisco-blog]

Undulus Asperatus (Asperatus) clouds