A rare wave cloud formation captured on the brink of sunset in the Bay of Plenty has been described as "magic". The rare wave-shaped clouds, known as Kelvin-Helmholtz instability waves, were spotted and photographed by Amy Christie Hunter, who later shared the picture on Facebook. High altitude can be another contributing factor, simply because there is more air for the rain to fall through before reaching the ground. As physicists William Kelvin and Hermann von Helmholtz discovered, the difference in the speeds and densities of these fluids creates a shearing force where they meet, producing undulations in the boundary between the two. When clouds happen to form at the horizontal boundary, this invisible air process is briefly made visible. (CNN) — A rare formation of clouds wowed onlookers at Virginia's Smith Mountain Lake on Tuesday. Mackerel-type cirrocumulus can be an indicator of warm winds lifting up and flowing out from a distant thunderstorm. [1] Often, ice crystals can be found downwind of the waves. 12 pp. … Mammatus clouds are rounded, pouch-like protrusions that hang from the undersides of clouds. Northern Colorado. The clouds are called Kelvin Helmholtz clouds… Incredible photos in Auckland show wave-like clouds rippling across the sky. These spooky forms appear downwind of mountains. Tour guide Dave Lacey of South Coast Tours, the same folks who captured the mola mola sighting near Thomas Creek Bridge earlier this month, took this photo of the clouds on Friday.. Meteorologist Brad Schaaf of Medford’s National Weather Service office told the Outpost that the clouds are a rare … They have iridescent colours but are higher and much rarer than ordinary iridescent clouds. The descending ice leaves a rounded hole in the cloud layer, which expands swiftly outwards as the frozen boundary spreads. The observatory explained that the rare phenomenon, called a KH-lenticular or Kelvin-Helmholtz wave cloud, "forms when a large increase in winds occurs over a small vertical distance within a cloud." Their name derives from the Latin mamma, which means "udder" or "breast", and they can extend over many hundreds of miles of cloud. Asperitas clouds are so unusual, they weren't officially recognised until June 2015. Not an official cloud classification but rather a "supplementary feature", virga form when rain or snow begins to fall but evaporates or sublimates in mid-air. It's the resistance of the cool air to this motion that causes the ripples. But it only lasts a few minutes before dispersing without a trace. Part I: Wave Clouds. Without these seed particles, the droplets must be cooled below -40°C before they will freeze. San Diego, CA: Academic Press, 1977. The clouds are known as Kelvin-Helmholtz instability waves and are named after the scientists who studied the physics behind them. Despite their temperature, these supercooled droplets remain liquid due to a lack of "seed" particles for ice to grow on. 63, No. A Virginia resident captured a rare cloud formation hovering over the skyline near her home.. Amy Christie Hunter posted a photo of the wave-shaped clouds to Facebook on Tuesday evening. Though beautiful, these turbulent atmospheric waves are a sign that the air is extremely unstable and may be dangerous to aircraft. Nacreous clouds, sometimes called mother-of-pearl clouds, are rare but once seen are never forgotten. The waves in the cloud are also an indication of severe wind shear, according to the forecasters. In the descending part of the wave, those clouds will evaporate due to adiabaticheating, leading to the characteristic clouded and clear ban… Wave clouds (sometimes called undulatus or billow clouds) like these are the product of atmospheric gravity waves. A rare series of 5 unique images showing the formation of Kelvin-Helmholtz clouds from a base of altocumulus over South-East England in August 2018. Nacreous Clouds. If there is enough moisture in the atmosphere, clouds will form at the cooled crests of these waves. What sets them apart from regular violent storms is a persistent rotating updraft called a mesocyclone, which allows the storm to sustain itself over many hours. These rare clouds, sometimes called mother-of-pearl clouds, are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. Rare Wave-Like Clouds Over Virginia Mountain Look Like Van Gogh's Famous 'Starry Night' The phenomenon's known as Kelvin-Helmholtz waves, wherein specific atmospheric conditions create clouds that appear in wave-like patterns in the sky. A rare formation of clouds wowed onlookers at Virginia's Smith Mountain Lake on Tuesday.. From the ethereal to the ominous, our planet's skies are teeming with strange clouds. Lenticular clouds are eerie because they seem to hover in place, even in a steady wind. When the cloud reaches the top of the troposphere – the bottom layer of Earth's atmosphere, which contains all the weather – a distinctive anvil-shaped thunderhead forms. Despite their ominous appearance, they tend to dissipate without turning into storms themselves. [3] Under certain conditions, long strings of lenticular clouds can form, creating a formation known as a wave cloud. As a type of polar stratospheric cloud, they play a central role in the chemical destruction of the ozone layer. Amy Christie Hunter spotted the wave-shaped clouds on … A., Lawson, R. P. (2006) In Situ Observations of the Microphysical Properties of Wave, Cirrus, and Anvil Clouds. These clouds look like ocean waves, and can be a sign of turbulence in the sky. 1. "Mackerel sky and mares' tails make tall ships carry low sails." Amy Hunter told AccuWeather that the stunning sight in the evening sky only lasted less than 60 seconds — but the unique phenomenon has since left a lasting impression on millions. Multi-level mountain wave clouds form when the moisture in the air above the mountain is located in distinct layers, and vertical mixing is inhibited. These tubes get caught in the updraft and tilt upwards into the storm. These super rare wave-shaped clouds were photographed yesterday in Erie. 'In the case of these cloud patterns, the winds are moving faster at the top of the cloud, than the winds at the bottom of the cloud, just like how waves are created on water. Rare disc-shaped clouds caught on camera by motorist Extraordinary lens shapes are exceptionally rare lenticular clouds and are also known as wave clouds This is a list of what I believe to be the top 10 rarest cloud formations. Ridges of cloud form where water vapour cools and condenses, while troughs of space form where it warms and re-evaporates. 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 Kelvin-Helmholtz cloud is named after the scientist who studied them. Scientists now want to find out how asperitas clouds form. ... Quite often, these clouds will form with cirrus, altocumulus, stratocumulus, and stratus clouds. Lenticular clouds form when the airflow streaming over the mountain is both stable and humid. In the descending part of the wave, those clouds will evaporate due to adiabatic heating, leading to the characteristic clouded and clear bands. A rare and short-lived cloud formation was spotted over Auckland as the sun was setting yesterday evening. As an air mass travels through the wave, it undergoes repeated uplift and descent. 1. 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. Kelvin-Helmholtz Wave Clouds This is a rare type of cloud that resembles ocean waves in the sky. [1], It is possible that simple convection from mountain summits can also form wave clouds. When moving air encounters an obstacle like a mountain, it is forced to rise up and over it. Nacreous clouds accelerate the chemical reactions that convert benign chlorofluorocarbons (CFCs) into ozone-destroying chlorine. Evaporation of the cloud causes a downdraft on the edges that erodes the cloud, forming a roll. 1 month ago. ©Cherie Ude, shown with permission. Like giant breakers in the ocean surf, magnificent cloud waves in the sky crested and crashed above Virginia’s Smith Mountain Lake on Tuesday evening. Their destructive might is second only to hurricanes. Because the clouds form at altitudes of over 15,000m, the Sun keeps illuminating them even when – from the point of view of people on Earth's surface – it is just below the horizon. No particular order in how ‘rare’ they are though. Baker, B. That rule of thumb became all-too relevant recently when an unbelievably rare cloud formation known as Kelvin-Helmholtz instability waves appeared in the sky over Smith Mountain Lake. A woman spotted a rare cloud formation over Smith Moutain in Virginia and shared the perplexing photo with a Facebook group. As the rain or snow evaporates away, it cools the surrounding air while increasing its humidity, until finally conditions are ripe for rain to pour. Now that's a flying saucer! A rare formation of clouds wowed onlookers at Virginia's Smith Mountain Lake on Tuesday.. Rare Wave-Like Clouds Spotted In Erie – CBS Pittsburgh Share or comment on this article: Rare cloud phenomena called Kelvin-Helmholtz waves spotted above Virginia mountain the water droplets are racing through the cloud, View image of A nacreous cloud at sunset (Credit: Pekka Parviainen/SPL), View image of Asperitas clouds (Credit: Laurent Laveder/SPL), View image of Kelvin-Helmholtz waves (Credit: Brad Lundgren), View image of A supercell thunderstorm over Nebraska (Credit: Roger Hill/SPL), View image of Cirrocumulus clouds forming a mackerel sky (Credit: Pekka Parviainen/SPL), View image of Mammatus clouds over Nebraska (Credit: Mike Hollingshead/SPL), View image of Clouds with virga, over the desert in Utah (Credit: Frank Zullo/SPL), associated with many different kinds of cloud, View image of A fallstreak hole over California (Credit: Kimberly Kradel/Alamy), surrounding droplets spontaneously freeze. The composition of the ice is currently an active topic of study. Named for the French "nacré", meaning "mother of pearl", nacreous clouds form close to the poles in the extreme cold of winter. Explore similar videos at Adobe Stock Members of the Society had been sending in photographs of "the cloud with no name": striking skyscapes that looked like a choppy sea viewed from below. This is a list of what I believe to be the top 10 rarest cloud formations. ONE of the world’s most spectacular clouds made a dramatic entrance for passengers on an … [3], The streamlines in these clouds have the steepest slope a few kilometers downwind of the lee slope of a mountain. Rare Wave-Like Clouds Crest Over Pa. Turnpike November 26, 2019 at 1:22 pm Filed Under: Clouds , Local TV , Pennsylvania Turnpike , Philadelphia , Ray Petelin , turnpike The photo shared on social media captured clouds that look like ocean waves in the sky. The crashing wave pattern is caused when swift, warm air flows over a colder, denser, more sluggish layer. In a storm system, virga frequently precede heavy rains when the air below the cloud isn't yet humid enough to support full precipitation. They form from small amounts of moisture in the air ahead of approaching weather fronts. They look like a sky full of floating jellyfish, their dangling tendrils being swept away by the wind. This became known as Kelvin-Helmholtz Instability (KHI). As the humid air bubbles up into cooler parts of the atmosphere, the moisture condenses, transforming fluffy cotton-wool clouds into a massive, lumbering rain cloud. Amy Hunter snapped this photo of incredible wave-shaped clouds that were spotted in Virginia. Fallstreak holes can grow as large as 50km in just one hour. Typical thunderstorms develop from cumulonimbus clouds. The ripples form when humid air at the far-flung edges of the storm system pushes past clear, cool air high in the sky. A mountain range can form a series of long wave clouds, but if the speed bump is more isolated, like a single mountain, the result can be oval-shaped clouds that look like UFOs,” explained physicist Patrick Chuang for Wired.com. The observatory explained that the rare phenomenon, called a KH-lenticular or Kelvin-Helmholtz wave cloud, "forms when a large increase in winds … This sinks and flows out of the base of the cloud, smothering the updraft and starving the storm of energy. These rare clouds, sometimes called mother-of-pearl clouds, are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. In a storm system, virga frequently precede heavy rains. Rare wave-like clouds spotted in Virginia. 3160–3185, "Cloud Crystals - Columns & Plates - Atmospheric Optics", https://en.wikipedia.org/w/index.php?title=Wave_cloud&oldid=994008655, Creative Commons Attribution-ShareAlike License, This page was last edited on 13 December 2020, at 17:52. As a result, they are being analyzed to increase our understanding of how these upper-level ice clouds influence the Earth's radiation budget. As an air mass travels through the wave, it undergoes repeated uplift and descent. One of the rarest and most fleeting formations, this cartoon-like breaking wave is the Holy Grail for many cloud-spotters. If the speed difference is just right, the tops of the denser ripples can roll up, surge forwards, and tip over in a series of vortices, just like a breaking ocean wave. Like all good folk sayings, there is some truth to this one. "Kelvin-Helmholtz waves develop due … It oscillates like this for a while, and on the upward part of the waves, clouds form as rising air cools. They are most commonly spotted rolling across the North American plains, chasing convective thunderstorms. This sets up a system where the up- and downdrafts become separated, allowing the storm to maintain its rage for hours. On rare occasions, they may also occur with cumulus clouds. The cloud's billowing wave pattern is often a sign of potential turbulence for aircraft. A woman in Virginia snapped a picture of a rare cloud formation in the sky near Roanoke. Read about our approach to external linking. After wind blows up and over a barrier, like a mountain, the air continues flowing through the atmosphere in a wavelike pattern. However, this doesn't always occur. Kelvin-Helmholtz clouds look like breaking waves in the ocean. Lidiya. This rare cloud looks like breaking ocean waves. It was not until 1802 that Luke Howard started classifying clouds into groups. All tornadoes are associated with supercells, although not all supercells produce tornadoes. These clouds rarely form on windy and unstable days, but when conditions are just right, the natural phenomenon, known as Kelvin-Helmholtz Waves, occurs. ... Quite often, these clouds will form with cirrus, altocumulus, stratocumulus, and stratus clouds. The ice crystals are mostly small spheroidal and irregular-shaped particles. The resulting instability causes the breaking wave formation, both in the ocean and the air. If the wave continues, a series of roll clouds, called a street, can form. Nacreous Clouds. As it flows upwards and cools, the moisture in the air condenses to form clouds at the crests of the standing wave. The prettiest jellyfish skies occur mostly with high clouds that tend to form individual cloudlets, like altocumulus and cirrocumulus. Named for their smooth, lentil-like appearance, altocumulus lenticularis clouds (pictured above) are believed to be one of the most common explanations for UFO sightings. Rare wave clouds rolled through the sky over Smith Mountain Lake in Virginia on Tuesday: ‘It was so amazing’ ... Kelvin-Helmholtz wave clouds don’t last long. ... 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 that have stretched through the sky. Supercells are the least common kind of thunderstorm. In fact the water droplets are racing through the cloud, carried by the wind. A stable air mass will continue to rise and dip for a little while as it travels away from the mountain, setting up an invisible "standing wave". Supercells can produce treacherous winds, tennis-ball-sized hailstones and flash floods. They occur when there is a strong vertical shear between two … Bad, bad clouds! Pretor-Pinney proposed the name asperatus, meaning "roughened" or "agitated". Rare wave-like clouds spotted at Smith Mountain Lake. And a brief description of each. Transcript for Rare wave-shaped clouds hover over VA skyline Under this happened on this Thursday morning starting with quite a sight in the sky news wave clouds Hulu alone adult fat. facebook; twitter ... “Wave clouds form in a stable atmosphere where the cloud itself isn’t able to develop into a vertical state because it … LAKEWOOD, Ohio -- You’re used to waves on Lake Erie. The resulting instability causes the breaking wave formation, both in the ocean and the air. January 2008. These rare clouds, sometimes called mother-of-pearl clouds, are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. On rare occasions, they may also occur with cumulus clouds. The rare wave-shaped clouds, known as Kelvin-Helmholtz instability waves, were spotted and photographed by Amy Christie Hunter, who later shared the … Also known as hole-punch clouds, these are holes or slashes that appear in layers of mid-to-high-level cloud, when a patch of moisture suddenly starts to freeze and fall. Like lenticular clouds, they have been mistaken for UFOs, but they are arguably at their most dramatic at sunset, when they appear like fiery wounds to the sky. When attached to the underside of low, gloomy clouds like nimbostratus, they give the impression of the cloud being streaked and smudged towards the ground. A Singapore resident captured a rare cloud formation hovering over the Singapore skyline near her home. Whether this happens depends on the saturation of the air. By. When gentle ripples begin to form across the entire sky, it's a good bet that the storm or its remnants will arrive in just a few hours. In a supercell, vertical wind shear creates huge horizontal tubes of spinning air. For thousands of years, mankind has gazed skyward with a mixture of awe and wonder at the beauty and variety of clouds such as these 5 Rare Mind-blowing Cloud Types. As a result, the cloud puffs downwards. Journal of the Atmospheric Sciences: Vol. These clouds form high in the sky, and the afternoon sun catching their underbellies gives them a dappled, silvery sheen. Rare wave-like clouds known as Kelvin-Helmholtz clouds were spotted above Brookings last week. These rare clouds, sometimes called mother-of-pearl clouds, are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. Here’s what caused those rare wave clouds over Denver on Sunday night Kelvin-Helmholtz clouds were spotted over parts of the Denver metro area on Sunday night, an extremely rare … That's because cirrus clouds – thin, wispy, collections of ice crystals – are harbingers of change. Cade Hughes said he and his wife were relaxing on … They are some of the highest and rarest clouds on Earth, but these iridescent specimens are both beauty and beast. Since then, a sprinkling of variations and sub-classifications has been added to Howard's work, leaving us with a rich nomenclature that has remained unchanged since 1951. KDKA viewer Ken Jones captured a photo of rare wave-shaped clouds that he saw over the Turnpike on the way to Philadelphia. One of the rarest and most fleeting formations, this cartoon-like breaking wave is the Holy Grail for many cloud-spotters. The "morning glory" is a very rare example of a type of wave cloud. "The base of these clouds is often above 16,500 feet (5,029 meters), as this is where the difference in wind speed in the atmosphere tends to be greatest," adds weather forecaster and former BBC Weatherman, Liam Dutton. The ripples of sunset in the sky the droplets must be cooled -40°C. 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