Science
Related: About this forumKelvin Helmholtz clouds (earthsky.org)
It looks like someone painted the sky with breaking ocean waves. They are called Kelvin Helmholzt clouds, aka as billow clouds or shear-gravity clouds.
Heres a special kind of cloud known to scientists as a Kelvin Helmholtz cloud. They look like breaking ocean waves, with the rolling eddies seen at the top of the cloud layers usually evenly spaced and easily identifiable. Kelvin Helmholtz clouds are named for Lord Kelvin and Hermann von Helmholtz, who studied the physics of the instability that leads to this type of cloud formation.
How Kelvin Helmholtz clouds form. A Kelvin Helmholtz instability forms where theres a velocity difference across the interface between two fluids: for example, wind blowing over water. Youll often see the characteristic wave structure in this type of cloud when two different layers of air in our atmosphere are moving at different speeds. The upper layers of air are moving at higher speeds and will often scoop the top of the cloud layer into these wave-like rolling structures.
The clouds often form on windy days, when theres a difference in densities of the air, for exmaple, during a temperature inversion.
These clouds are often good indicators of atmospheric instability and the presence of turbulence for aircraft.
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more: http://earthsky.org/constellations/kelvin-helmholzt-clouds
2naSalit
(86,862 posts)at least a few times a year over the mountains. I always wondered if they had a specific name... now I know!
Thanks.
BB1
(798 posts)but I live in northwest Europe, where the weather is usually quite mild. i did see some lenticularis clouds last year in the south of France, but that's as exotic as it gets.
packman
(16,296 posts)So long and thanks for all the fish - Doug Adams. It's a prelude to the hyperspace bypass that an alien race is going to build and earth is being torn down so the bypass can be constructed.
packman
(16,296 posts)Response to eppur_se_muova (Reply #4)
packman This message was self-deleted by its author.