en.wikipedia.org/wiki/Altostratus_undulatus_cloud

The altostratus undulatus is a type of altostratus cloud with signature undulations within it. ... Also referred to as billow clouds, wind row clouds, or wave clouds, variations of the undulatus can be elements that have merged or single elements  ...

ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/oth/kh.rxml

Billow clouds are created from instability associated with air flows having marked vertical shear and weak thermal stratification. The common name for this ...

ww2010.atmos.uiuc.edu/(Gl)/guides/mtr/cld/oth/kh.rxml

Billow clouds are created from instability associated with flows having marked vertical shear and weak thermal stratification. The common name for this instability ...

glossary.ametsoc.org/wiki/Billow_cloud

Apr 25, 2012 ... Some forms are the result of shear instability (Kelvin–Helmholtz), and some result from gravity waves. Billow clouds are present when there is ...

www.eoas.ubc.ca/courses/atsc113/flying/met_concepts/01-met_concepts/01b-special-clouds/billow.html

Special Clouds > Billow Clouds. Learning Goal 1b. Recognize special clouds ( e.g. castellanus, billow, lenticular, rotor, banner, fractus, etc.) Wind shear (change  ...

www.merriam-webster.com/dictionary/billow%20cloud

Billow cloud definition is - a long narrow cloud or usually a series of such clouds roughly parallel to each other caused by the flow of one layer of air over another  ...

earthsky.org/earth/kelvin-helmholzt-clouds

May 14, 2019 ... They're called Kelvin-Helmholtz clouds, aka billow clouds or shear-gravity clouds , and they look like breaking ocean waves.

epod.usra.edu/blog/2016/05/billow-clouds-seen-from-above-and-below.html

May 5, 2016 ... These clouds are known as billow clouds. Wind shear is a key ingredient to their formation -- unstable atmospheric layers of varying densities ...

www.thoughtco.com/kelvin-helmholtz-clouds-3443792

Mar 11, 2019 ... Kelvin-Helmholtz clouds are a stunning sight. Also known as billow clouds, you'll notice their distinct formation when you see breaking waves in ...