Disc-shaped clouds appear in sky – before 'multiplying'
Bizarre footage of two mysterious large ring-shaped clouds appearing in the sky above a Russian city has baffled the internet.
Video has emerged showing the two disc-like clouds floating before a third suddenly becomes visible.
Towards the end of the footage, a plane is seen heading towards the sky rings and pierces the first circle.
Local media said a fourth ring appeared shortly afterwards.
The incident was filmed in the city of Irkutsk in the southern Russian region of Irkutsk Oblast by numerous local residents.
Video at link:
Appearing as a slender, horizontal spiral of cloud, cirrus Kelvin-Helmholtz is one of the most distinctive cloud formations. However, it tends to dissipate only a minute or two after forming and, as a result, is rarely observed.Average height is around 16,500 ft.
FULL STORY: https://www.accuweather.com/en/weat...g-photo-of-kelvin-helmholtz-wave-cloud/688361Mountaintop camera captures images showcasing unusual sight in the sky
The Mount Washington Observatory posted a photo to Twitter early Monday morning that showcased an unusual cloud phenomenon: a Kelvin-Helmholtz wave cloud.
KH-lenticulars, or Kelvin-Helmholtz, were named after Hermann von Helmholtz and William Thomson, who was better known as Lord Kelvin, the two scientists who discovered the atmospheric instability that leads to this phenomenon. ...
The image is a rarity as Kelvin-Helmholtz clouds usually do not last long in the sky and therefore are difficult to document, according to AccuWeather Meteorologist Jesse Ferrell.
He further explained that they occur in unstable atmospheric conditions when air varies in density due to different temperatures. ...
The cloud formations can also cause trouble for pilots in the sky.
"Changes in wind speed vertically in the atmosphere (called wind shear) can indicate turbulence for airplanes," he said, "although the KH wave clouds are just giving form to an atmospheric wave that is also present in 'clear air turbulence.'"
These waves in the sky are formed similarly to ocean waves, with high winds blowing over the water, "sculpting the flat water into wave formations," Ferrell said. ...
Some experts believe that the famous "Starry Night" painting by Vincent Van Gogh was inspired by KH wave clouds, but Ferrell believes it to be unlikely.
"I don't think that's likely because they aren't oriented correctly, and you wouldn't be able to see the clouds well at night," he said. "It's more likely he was just channeling fluid dynamics."
Lovely. I have a photograph of a set of these somewhere though not as good as this one. I will see if I can dig it out.
Rodan?A mountaintop observatory in New Hampshire captured a notably dramatic image of a Kelvin-Helmholtz cloud.
That's not an angel, that's Maria Von Trapp!Cannot locate the original. Here's another more recent example (2018):
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Video account from the photographer [Facebook but requires no log-in]:
That webpage still exists, and today they've added the most 'perfect' lenticular cloud photo I think I've ever seen ...
This photo is a finalist in the Royal Meteorological Society's (RMS) 2020 Weather Photographer of the Year contest.
I half-expect a huge spacecraft to come out of that cloud.Mammatus clouds over Edinburgh yesterday evening as a result of Storm Dudley:
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