They are most common in Antarctica, but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian Federation. Non-lenticular nacreous clouds may appear to move slowly, due to their distance from the observer, as they appear above the setting Sun. These nacreous clouds are also called "polar stratospheric clouds" and get their brilliant, rainbow colors from sunlight that's reflected from below the horizon. Nacreous clouds need temperatures below -78C to form. They form when methane in. High-level clouds: The three main types of high clouds are cirrus, cirrostratus, and cirrocumulus. However, the conditions have not been suitable for viewing the aurora. . National Geographic, 3 Feb. 2016 The cold air the storm blew in also led to the formation of beautiful nacreous clouds. Nacreous clouds are some of the rarest clouds on the planet. Nacreous clouds are often lenticular wave clouds and thus are found downwind of mountain ranges that induce gravity waves in the stratosphere. Altitude: 68,000ft - 100,000ft. Nacreous clouds are some of the rarest clouds on the planet. Simon Brown, Services Director at the Met Office, explains how meteorologists forecast and communicated the extreme events. This difference in wind speed or direction is called wind shear. They are most common in Antarctica , but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian . The clouds are so high up to 82,000 feet above the Earth that they continue to glow in these incredible hues long after the sun . Intense thunderstorms have updrafts strong enough to punch through the tropopause, and the tops of such storms can grow to 65,000 feet. . This is a question our experts keep getting from time to time. Why are mammatus clouds green? They are often found downwind of mountain ranges, which can induce gravity waves in the lower stratosphere. The photo above shows a breath-taking display of nacreous clouds at sunset over the continental divide in Colorado. They are most common in Antarctica, but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian Federation. The stratosphere is generally very dry and so cloud formation is rare, but it seems as though recent storms may have driven moisture high into the atmosphere. Kirsty McCabe takes a closer look through the gloom. Rumored to be the inspiration for Van Gogh's masterpiece Starry Night, they are incredibly distinctive. Also known as " nacreous " or "mother of pearl" clouds, these icy clouds form in the lower stratosphere when temperatures drop to around minus 85C. Nacreous clouds form in the world's polar regions in winter, and only exist at high altitudes in the stratosphere, 70,000 feet (21,300 meters) up, in the ozone layer. Some people have assumed they are seeing the Northern lights due to the array of colours observed. These clouds appear mostly during winter in regions of high latitude. Polar stratospheric clouds (PSCs), also known as nacreous clouds from nacre, or mother of pearl, due to their iridescence, are clouds in the winter polar stratosphere. They are most common in Antarctica, but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian Federation. n. A stratospheric cloud resembling a cirrus, showing iridescent coloration when the sun is several degrees below the horizon. s klaudz] (meteorology) Clouds of unknown composition, whose form resembles that of cirrus or altocumulus lenticularis, and which show very strong irisation similar to that of mother-of-pearl, especially when the sun is several degrees below the horizon; they occur at heights of about 12 or 18 miles (20 . Besides, nacreous clouds are usually linked with extra-high surface breezes that show the While clouds usually don't form in the stratosphere because it is normally too dry for ice crystals to develop, nacreous clouds can be created there because they consist of ice crystals, supercooled water and nitric acid. Iridescence is most brilliant when the Sun is several degrees below the horizon. . The formation of polar stratospheric clouds (PSCs) is sometimes attributed to cooling induced by mountain waves. During the return of spring sunlight these radicals destroy many ozone molecules in a series of chain reactions. Where are nacreous clouds found? . Where are nacreous clouds found? The range of ways in which clouds can be formed and the variable nature of the atmosphere results in an enormous variety of shapes, sizes and textures of clouds. By day, nacreous clouds often resemble pale Cirrus. What type of clouds are nacreous clouds? Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. It uses fabrics containing Outlast Technology, which is a cooling method originally developed for NASA. When viewed from space, they are called polar mesospheric clouds (PMCs), detectable as a diffuse scattering layer of water ice crystals near the summer polar mesopause. Words nearby nacreous cloud All cumulus clouds develop as a result of convection. What weather is associated with Nacreous clouds? Introduction and principles of cloud classification, Orographic influence on the windward side, Nitric acid and water polar stratospheric clouds, Noctilucent clouds (polar mesospheric clouds), Classification and symbols of meteors other than clouds, Definitions and descriptions of meteors other than clouds, Observation of meteors other than clouds from the Earth's surface, Observation of hydrometeors other than clouds, Observation of clouds from the earth's surface, Observation of clouds from mountain stations, Code specifications and coding procedures, Coding instructions of clouds in the codes C, Issues for observation of clouds from aircraft, Descriptions of clouds as observed from aircraft, Appendix 1 - Etymology of latin names of clouds, Appendix 2 - Historical bibliography of cloud classification, Appendix 3 - History of cloud nomenclature, Appendix 4 - Lists of tables, figures and acronyms, Foreword to the 1987 edition of volume II. These stratospheric clouds are often mistaken for cirrus clouds. Both learned about life at sea, contributed to the daily duties onboard, educated the crew and students onboard in meteorological topics, participated and led weather observations, and discovered many of the intricacies of sailing on a tall ship! $20. The text enclosed in grey-shaded boxes, like this example, comprises Annex I to the Technical Regulations (WMO-No. Also known as polar stratospheric clouds, these clouds are usually seen in polar regions. Now, we have got a complete detailed explanation and answer for everyone, who is interested! Cloud Level: Upper Stratosphere. Lenticular clouds - mountain waves, banner clouds Pileus clouds - these clouds are formed when moist winds are deflected up and over cumulus clouds Mammatus clouds - produced by moist, sinking air cooler than the surrounding air mass Contrails - sometimes produced by aircraft Nacreous clouds - found in the stratosphere Within a cloud, ice crystals will only form if a special type of particle is present for the ice to form on. 2 Feb 2016. The fluffy, cauliflower-shaped cumulus is one of the most common and distinctive types of cloud. Their sheet-like forms slowly undulate and stretch as the waves evolve. Where are lenticular clouds found? The ice particles that form nacreous clouds are much smaller than those that form more common clouds. I dedicate this to DD Kissing Rain, who flew away too soon.None of the content on this channel belongs to me. Almost all. Which altitude is a nacreous cloud most likely to form? Unfortunately, it does not feel like cotton balls or cotton candy, but most people have technically touched a cloud before. Define nacreous cloud. Polar mesospheric clouds (PMCs)also called noctilucent cloudsare very thin ice clouds that form around 83 km near the polar summer mesopause. : NatureIsFuckingLit Rare phenomenon called Nacreous Clouds. Mother Of Pearl Clouds Nacreous Clouds Photograph. The Nacreous Mattress Pad is one of Slumber Cloud's products that is engineered for more comfort during sleep. PSCs are wave clouds. This phenomenon can be best observed within the first two hours after sunset when rays of light illuminate the clouds from below the horizon. These clouds show very strong irisation, or iridescence, similar to that of the mother-of-pearl, especially when the sun is several degrees below the horizon. Nacreous clouds are often lenticular wave clouds and thus are found downwind of mountain ranges thatinduce gravity waves in the stratosphere. During condensation, molecules of water vapor combine to make tiny liquid water droplets that hang in the air. Nacreous or ordinary iridescent clouds? Shape: large thin discs, often reflecting vivid colours, Latin: no direct Latin translation, but the old English word Nacre means mother of Pearl. Kelvin Helmholtz Waves are perhaps the rarest cloud formation of all. ), Shaped like large thin discs, often reflecting vivid colours, Generally found in latitudes higher than 50, They form in temperatures below -80 C in the lower stratosphere, A mixture of ice crystals and nitric acid, The best time to see them is during a winter sunrise or sunset, There is no direct Latin translation, but the old English term Nacre means mother of pearl.. They are mainly associated with cirrus, altocumulus, and stratus clouds over 5,000m. What are nacreous clouds? They are formed like any other clouds, but at very high altitudes, 15,000 - 25,000 meters (49,000-82,000 ft) and get the rainbow like colours when the sun hits them before rising above the . On rare occasions, they have been reported inother parts of northern Europe. Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. Also known as polar stratospheric clouds, these clouds are usually seen in polar regions. Nacreous clouds form in the lower stratosphere over polar regions when the Sun is just below the horizon. Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. They occur at heights of about 12 to 18 miles (20-30 km). Stratus clouds tend to be featureless, low altitude clouds that cover the sky in a blanket of white or grey. $22. Nacreous clouds are classified into three types, Ia, Ib and II, according to their chemical composition, height and ambient temperature. PANTONE 15-4504 TCX Nacreous Clouds is available in the following Pantone products: Add To Cart. That creates a . Thousands of new, high-quality pictures added every day. Polar stratospheric clouds (PSCs), also known as nacreous clouds from nacre, or mother of pearl, due to their iridescence, are clouds in the winter polar stratosphere. Sunlight shining through tiny ice particles ~10m across produce the characteristic bright iridescent colors by diffraction and interference. They are often found downwind of mountain ranges which induce gravity waves in the lower stratosphere . You can see fog because of these tiny water droplets. They are most common in Antarctica, but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian Federation." They are most common in Antarctica , but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian . Check out our nacreous clouds selection for the very best in unique or custom, handmade pieces from our shops. No results found {{app.scroll_content}} How to . Yva Momatiuk John Eastcott. They only form when the. The characteristic bright iridescent colours, resulting from diffraction and interference of light waves, suggest that the clouds are composed of similarly sized spherical crystals of about 10 m in diameter. Nacreous clouds, or mother-of-pearl clouds, form in the very cold regions of the lower stratosphere, 15-25 km (9-16 miles) high and well above tropospheric clouds. Elsewhere their appearance is often associated with severe tropospheric winds and storms. (The stratosphere's air is so dry, clouds can only form when temperatures are extremely cold, as in -100 F cold!) Because of the very low temperatures required, nacreous clouds are usually only visible from the UK when the cold air which circulates around polar regions in the stratosphere (known as the stratospheric polar vortex) is displaced and hovers temporarily over the UK. Name Meaning: Nacra-an old English word meaning mother of pearl. Image: Nacreous clouds over Aberdeen on 29th January 2016Credit: Stephane Gentile, Associate Fellow of the Royal Meteorological Society. These extreme temperatures are only found much higher up in the atmosphere at altitudes of around 15-25km, known as the stratosphere. Nacreous Clouds. When Kirsty McCabe first presented the weather she was told not to use the word precipitation on air. Although the Antarctic atmosphere is normally freezing many Antarctic clouds contain both water droplets and ice crystals. "Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. So for all of you Loch Ness Monster hunters scaling the depths of Scotland's Inverness, if you don't end up . The stratosphere is very dry; air there contains little water vapor. Advertisement Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. I initially thought these were lenticular clouds, then noctilucent clouds, but finally realized that this phenomenon better matches the description of nacreous clouds. Nacreous clouds, also known as mother-of-pearl clouds . Pronunciation of nacreous clouds with 2 audio pronunciations, 10 translations, 1 sentence and more for nacreous clouds. The latest breakthroughs, research and news from the Met Office. N acreous clouds, also known as "mother-of-pearl clouds" or "polar stratospheric clouds", are a rare type of cloud best known for their vivid and sometimes luminous colours. The colours are reminiscent of the colours which reflect from a thin layer of oil on top of water, an effect known as iridescence. Why is it that fog often forms in autumn and winter, and is there an easy way to predict when it will clear? . "Vivid and lustrous, wafting iridescent waves of color filled this mountain and skyscape near Tanndalen, Sweden . Because of this, few clouds are found in this layer; almost all clouds occur in the lower, more humid troposphere. Their presence encourages the chemical reactions that break down the ozone layer, which acts as an essential shield protecting us from the most harmful of the sun's rays. (Pronounced ney-kree- uh s, the name refers to a resemblance to nacre, or mother-of-pearl.) Will the golden apple archipelago be permanent. Nacreous clouds only appear near the North and South poles and at extremely high altitudes, like 70,000 feet, or twice as high as any airliner flies. These clouds have sheet-like arrangements that gradually rise and fall while extending amid the emerging waves. The stratosphere is generally very dry and so cloud formation is rare, but it seems as though recent storms may have driven moisture high into the atmosphere. American Heritage Dictionary of the English Language, Fifth Edition. Fog shows up when water vapor, or water in its gaseous form, condenses. These smaller particles scatter light in a different way, which is what creates the distinctive luminescent appearance. SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE? PSCs are also called nacreous clouds. nacreous cloud synonyms, nacreous cloud pronunciation, nacreous cloud translation, English dictionary definition of nacreous cloud. Unusual and Interesting Clouds Nacreous clouds: Soft, pearly luster Form at altitudes about 25 to 30 km (in stratosphere) Also called mother-of-pearl clouds Primarily ice crystals Associated with high latitudes in extremely cold air near the poles in winter Seen after sunset (twilight) Above and right: Contrails forming . PSCs are wave clouds. Nacreous Nacreous (Crossword clue) We found 7 answers for "Nacreous" . Faster moving air at the top of the cloud scoops the top of the cloud layer forward, producing a striking wave-like pattern up in the sky. Later, with the Sun further below the horizon, the various colours are replaced by a general coloration thatchanges from orange to pink and contrasts vividly with the darkening sky. Nacreous clouds only form in the polar winter, when the lack of sunlight helps temperatures to drop particularly low. They are often found downwind of mountain ranges, which can induce gravity waves in the lower stratosphere. It was taken on October 28, 2006, near Estes Park, Colorado. Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. Some examples of PSCs explained by this mechanism are found in the literature. Nacreous clouds form in the lower stratosphere over polar regions when the Sun is just below the horizon. This northern winter season they have been making unforgettable appearances at high latitudes, though. If Cirrus and nacreous clouds coexist after sunset, the high altitude of the nacreous clouds causes them to show bright colours after the Cirrus has already turned grey. Instead, they believe the unusual lights were down to high-altitude clouds known as nacreous clouds.. Full review. As sunlight passes through the droplets, it diffracts, separating the colours into different wavelengths, creating the beautiful spectrum of colours that have been observed. Nacreous clouds are high-level clouds that occur in the stratosphere over polar regions at heights of 15 000 - 25 000 meters (49 000 - 82 000 ft). Their Nacreous Mattress Pad features NASA-engineered temperature regulating technology for more comfort in one's slumber. They are most common in Antarctica, but have also been observed in the Arctic, Scotland, Scandinavia, Alaska, Canada and the northern Russian Federation. The rare sightings occur when sunlight from below the horizon is reflected and refracted by . Nacreous clouds form in the lower stratosphere, which is located between 10 and 30 km (6 and 19 miles) above the Earth's surface. Jeremy DeMoss and Anthony Merendino had the great opportunity to board the tall ship Pelican of London and embark on voyages as Scientists in Residence during 2022. Clouds resembling Cirrus or Altocumulus lenticularis and showing very marked irisation, similar to that of mother of pearl; the most brilliant colours are observed when the Sun is several degrees below the horizon. The ice particles that form nacreous clouds are much smaller than those that form more common clouds. The clouds are formed over forests due to evaporation and evapotranspiration courtesy of the dense tree canopy found in forests. ous adj. Ice polar stratospheric clouds, or nacreous clouds, occur mainly at high latitudes during the winter when temperatures in the stratosphere fall below the frost point. Weatherman Liam Dutton explains in less than two minutes in this short video explainer.More cloud explainers - https://www.youtube.. Nacreous clouds are rare and very high clouds, known mainly for the coloured light they reflect after sunset and before sunrise. Please support the creators below.Captions pr. For this reason, they are sometimes known as polar stratospheric clouds. Why are clouds rare in the stratosphere? WhatRead More Who we are, what we do and organisational news. In contrast, the clouds we usually see form within the troposphere, the area of the atmosphere that extends up to around 10km. They are often found downwind of mountain ranges, which can induce gravity waves in the lower stratosphere. Verification, impacts and post-processing, Climate information for international development, Science for Impacts, Resilience and Adaptation (SIRA), Atmospheric processes and parametrizations, Regional model evaluation and development, Environmental Hazard and Resilience Services, National Meteorological Library & Archive. The ice particles that form nacreous clouds are much smaller than those that form more. Cumulus clouds look like fluffy, white cotton balls in the sky. Nacreous clouds are beautiful, rare cloud formations found in the circumpolar Arctic, Antarctica, and some parts of the UK. Last Update: October 15, 2022. Mother Of Pearl Clouds Nacreous Clouds Photograph. But the 'P' word is actually quite simple. However, they change dramatically before dawn and after sunset. Stratospheric clouds (PSCs), also known as nacreous clouds, emerge from extreme low temperatures that characterise the polar vortex. Nacreous clouds form in the lower stratosphere over polar regions when the Sun is just below the horizon. Nacreous clouds thatare also lenticular will be stationary at the crest of a gravity wave, although the air flows through the cloud. The devastating Plainfield tornado of Aug. 28, 1990, developed from a thunderstorm that towered to 65,000 feet. Nacreous clouds are critical for the reactions which cause the destruction of ultraviolet-absorbing ozone. Polar stratospheric cloud Polar stratospheric clouds ( PSCs) are clouds in the winter polar stratosphere at altitudes of 15,000-25,000 m (49,000-82,000 ft). Per-Andre Hoffmann. The polar summer mesopause is the coldest region of the atmosphere because of cooling that results from the gravity wave-driven circulation in the mesosphere. They form when the Sun is just below the horizon and its light passes through a large number of tiny ice crystals in the air. Stratus. Nacreous Clouds And Evening Sun Photograph. $25. Why are polar stratospheric clouds dangerous? They are best observed during civil twilight, when the Sun is between 1 and 6 degrees below the horizon, as well as in winter and in more northerly latitudes. MetMatters explains the different forms that water takes when falling from the sky. The record-breaking 2020 Antarctic ozone hole finally closed at the end of December after an exceptional season due to naturally occurring meteorological conditions and the continued presence of ozone depleting substances in the atmosphere. Nacreous clouds typically form in the winter polar stratosphere, a layer of our atmosphere around 15,000 to 25,000m in altitude. The ice particles that form nacreous clouds are much smaller than those that form more common clouds. Stratus clouds can loom for days, hiding the sun but never dropping . Find Nacreous clouds stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Sometimes, however, they occur as far south as England . Earth's tallest thunderstorms form in the tropics, where tops have been measured to about 75,000 feet more than 14 miles into the atmosphere. Polar stratospheric clouds (PSCs) are formed in the polar ozone layer when winter minimum temperatures fall below the formation temperature of about 78C. Most of the time, they don't stand out. Of all clouds, the low-level stratus has no depth or shape. Because they form in a polar vortex, they are associated mostly with very cold and dry weather. [1] Fashion, Home + Interiors Cotton Swatch Library. $ 14.90. nacreous cloud Also found in: Thesaurus, Encyclopedia . The ice particles that form nacreous clouds are much smaller than those that form more common clouds. These smaller particles scatter light in a different way, which is what creates the distinctive luminescent appearance. A picture of luminous nacreous clouds over Sweden was released by NASA on Friday. The Arctic Polar Stratospheric Vortex moves around much more than the Antarctic one therefore when it comes near the UK, we can see the clouds within it. 6 letters BRIGHT PEARLY 7 letters OPALINE 10 letters IRIDESCENT OPALESCENT 11 letters IRRIDESCENT Known as nacreous clouds or mother-of-pearl clouds, they are rare. Several rare sightings of nacreous clouds have been reported over the last few days, delighting cloud spotters, with photographs of the clouds coming from England and Scotland. The Nacreous clouds or Polar Stratospheric clouds (PSC) are a rare phenomena only visible in the mid winter in the polar regions. They can be less rare downwind of mountain ranges. They are most likely to be viewed when the Sun is between 1 and 6 below the horizon and in places with higher latitudes, such as Scandinavia and northern Canada. Swatch Card 15-4504X. The picture is taken in Jamtland, Sweden. PSCs are wave clouds. Paying attention to nacreous clouds in the stratosphere these are wave clouds found on the windward side of the mountain ranges that generate forces of gravity. While clouds usually don't form in the stratosphere because it is normally too dry for ice crystals to develop, nacreous clouds can be created there because they consist of ice crystals, supercooled water and nitric acid. The picture is taken in Jamtland, Sweden. Ice polar stratospheric clouds (nacreous clouds) form at temperatures below the ice frost point, typically near 85 C, which is colder than the average lower stratosphere temperature. : possessing the qualities of, consisting of, or abounding in nacre also : iridescent. Several rare sightings of nacreous clouds have been reported over the last few days, delighting cloud spotters, with photographs of the clouds coming from England and Scotland. Web Design by Fuze Digital, October 2022 Photo of the Month Competition, September 2022 Photo of the Month Competition, August 2022 Photo of the Month Competition. (CL), cloud medium (CM) and cloud high (CH) - according to the part of the atmosphere in which they are usually found. $27. The clouds are illuminated from below and often glow in vivid colours. Jennifer Ouellette, Ars Technica, 21 May 2020 Also called polar stratospheric clouds (or less precisely, rainbow clouds), nacreous clouds normally only form in high latitudes and at extremely cold temperatures. These unusual clouds typical present as colorful and wavy due to the "combination of scattering . Due to their high altitude and the curvature of the Earths surface, these clouds are lit up by sunlight from below the horizon and reflect it to the ground, shining brightly well beforedawnand afterdusk. In the Arctic, they are usually composed of nitric and sulphuric acid and only form within the Polar Stratospheric Vortex. The clouds are illuminated from below and often glow in. Everything you need to know about the forecast, and making the most of the weather. These clouds get their common names from their beautiful rainbow colors, which look a lot like the shiny iridescence of mother of pearl. Fog is a cloud that touches the ground. Reactions on liquid and solid PSC particles cause the highly reactive chlorine gas ClO to be formed, which catalytically destroys ozone (see Q9). Their formation may also be associated with severe tropospheric storms. 38.2k Posted by 2 years ago 2 2 Rare phenomenon called Nacreous Clouds. nacreous cloud: [noun] a luminous iridescent cloud that occurs at altitudes of about 85,000 feet — called also#R##N# mother-of-pearl cloud. Kelvin-Helmholtz waves form when winds move faster at the top of a cloud's layer than the bottom. Clouds are found almost exclusively in the troposphere. WikiMatrix After sunset, they are characterized by brilliant iridescent colours, which are more extensive and more intense than the localized irisation, or iridescence, that often appears on the edges of thin tropospheric clouds (for example,Altocumulus lenticularis). What type of clouds are nacreous clouds? Scientists have found that nacreous clouds . 49) and has the legal status of standard practices and procedures. . This page shows answers to the clue Nacreous, followed by 6 definitions like " Having a pearly luster ", " Lustrous, like mother-of-pearl " and " Of or pertaining to nacre ". Look at the glowing, pearlescent skies. Nacreous clouds form in the lower stratosphere over polar regions when the Sun is just below the horizon. If you wanted to touch an airborne cloud, the best way to do this is either skydiving or in a hot air balloon, though I would not want to be stuck in a cloud while in a hot air balloon. You can learn much more about nacreous clouds and ozone depletion on our partner website,MetLink. These lens-shaped orographic wave clouds form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere. This type of cloud, which is related to fog, hangs in a formless mass in stable weather conditions. Their formation may also be associated with severe . Clouds of unknown composition, whose form resembles that of cirrus or altocumulus lenticularis. Jan 10, 2020 Nacreous Clouds over Sweden Vivid and lustrous, wafting iridescent waves of color filled this mountain and skyscape near Tanndalen, Sweden on January 3. Nacreous clouds in Iceland. These stunning clouds are observed in the Antarctic each Austral spring and fall when upper air temperatures drop low enough for their formation.
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