bizarre, giant tubular cloud rolling across the sea (photo) | live science

bizarre, giant tubular cloud rolling across the sea (photo) | live science

Roll clouds are a type of arcus cloud, which is a category of low cloud formations. Their more common cousin is the shelf cloud, often seen on the leading edges of thunderstorms. Roll clouds sometimes form along with storms, too, born out of the storm's downdraft. Sinking cold air causes warm, moist air on the planet's surface to climb to higher altitudes, where the moisture condenses into cloud form. Winds from the storm "roll" the cloud parallel to the horizon, creating an effect that looks much like a horizontal tornado. Unlike shelf clouds, rolls clouds are completely detached from the bulk of the storm. [Gallery of Curious Clouds]

Roll clouds aren't dangerous in themselves, though, and many roll clouds form in relatively calm weather as a result of sea breezes. One of the most famous spots for these coastal roll clouds is off the coast of Queensland, Australia, where the so-called Morning Glory roll cloud forms regularly in fall months.

Roll clouds are just one of the weird weather phenomenon that can happen when winds go wild. Wave clouds, for example, look like ripples in the sky. They occur when a large landmass such as a mountain forces an air mass to rise to cooler altitudes, where the moisture in the air condenses. The air then drops like a wave, leaving a cloud to mark its peak.

roll cloud stretches across the sky over lake erie

roll cloud stretches across the sky over lake erie

A Chicago student has died after requesting he be taken off life support following a shooting last Thursday that left him paralyzed, his family has said. Max Lewis, 20, was attending the University of Chicago for the summer when a stray bullet struck him in the back of the neck while commuting on a train, according to CBSN Denver. The Denver-native was on his way home when he was struck. Lewis was rushed to the University of Chicago Medical Center where doctors had to put him on life support, ac

A woman has been accused of punching a 6-year-old Asian boy while hurling racial slurs at him and his mother in Las Vegas this week. What you need to know: The incident occurred at The Shops at Crystals, an upscale shopping mall located in the CityCenter complex. Tiktok user @uhmmajo managed to film part of the alleged attack, which shows the woman having an unhinged meltdown.

Britney Spears is in incredible shape, yall, and shes been showing it off in numerous Instagram posts of her bikini body. Her latest pic, however a stunning topless photo of her from behind had people questioning whether this one was actually her. In the topless photo, Spears shows off her amazingly toned back []

A single Loki episode is all thats left in the shows first season. After the fantastic developments in episode 5, next Wednesdays finale should deliver the final answers. Well get to see the last chapter of this new Lokis redemption journey. And well learn how the TV series will impact the upcoming MCU Phase 4 The post The answer to Marvels biggest Loki mystery might be hiding in plain sight appeared first on BGR.

The last few months of Donald Trumps presidency were marred by chaos and confusion after he lost the election. One of the key moments to highlight those tumultuous days involved Rudy Giuliani and his campaign to get the election results overturned amid his allegations of voter fraud. The message behind that press conference was completely []

The cast for "Bachelor in Paradise" season 7 has been revealed. The popular "Bachelor" spin-off -- which features fan favorites from both "The Bachelor" and "The Bachelorette" returning for another shot at love -- is finally back, with 19 contestants ready to find romance at a beachside Mexican resort. This is the first new season of "Bachelor in Paradise" to premiere in two years, as there was no 2020 season due to the COVID-19 pandemic.

Melania Trump is back in New York City, and her potential semi-permanent relocation now has her teenage son, Barron Trump, joining her for an outing in the Big Apple. The mother-son pair were spotted leaving their Manhattan home (Trump Tower, of course) this past week on July 7, and it looks the youngest Trump, who []

Rachel Nichols hosted her long-running afternoon TV show, "The Jump," Monday afternoon, and began with a brief apology: "I . . . don't want to let this moment pass without saying . . . how deeply, deeply sorry I am for disappointing those I hurt, particularly Maria Taylor," she said. It was a day after the New York Times published leaked audio from a private conversation Nichols had a year before, in which she suggested that Taylor, her colleague, would replace Nichols as host of the network's N

rhode island roll cloud looks otherworldly - videos from the weather channel

rhode island roll cloud looks otherworldly - videos from the weather channel

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video captures roll cloud in texas

video captures roll cloud in texas

This is not your typical cloudy sky. Truck driver Bonnie Mask, who lives near Amarillo, Texas, looked out the window around sunrise last week and spotted an odd sight: a long, tube-shaped formation called a roll cloud.

Apparently, its pretty rare, Mask told Yahoo News. She noted that she had never seen anything like it. There was some cool air that blew over as the cloud blew over the house, she said, adding that it was kind of strange."This is fairly rare, by the way, to have these things and see these things," Kim Cunningham, a meteorologist for the Weather Channel, told Yahoo News "especially when not associated with a thunderstorm. ... It's pretty cool though, and it probably freaked a lot of people out."According to LiveScience.com, the bizarre cloud is formed when cold air forces warm, moist air higher into the sky. Then strong winds "roll" the cloud into the tube shape parallel to the Earth's surface.

Viewers of the video agreed. Doggone posted on Yahoo, That is the freakiest thing I have seen so far weather-wise, that is. Kari J added, That is a little eerie and slightly ominous.After what Mask estimates to be about 20 or 30 minutes, the long cloud formation, which seems to stretch endlessly across the horizon, rolled on by.

A Chicago student has died after requesting he be taken off life support following a shooting last Thursday that left him paralyzed, his family has said. Max Lewis, 20, was attending the University of Chicago for the summer when a stray bullet struck him in the back of the neck while commuting on a train, according to CBSN Denver. The Denver-native was on his way home when he was struck. Lewis was rushed to the University of Chicago Medical Center where doctors had to put him on life support, ac

A woman has been accused of punching a 6-year-old Asian boy while hurling racial slurs at him and his mother in Las Vegas this week. What you need to know: The incident occurred at The Shops at Crystals, an upscale shopping mall located in the CityCenter complex. Tiktok user @uhmmajo managed to film part of the alleged attack, which shows the woman having an unhinged meltdown.

Britney Spears is in incredible shape, yall, and shes been showing it off in numerous Instagram posts of her bikini body. Her latest pic, however a stunning topless photo of her from behind had people questioning whether this one was actually her. In the topless photo, Spears shows off her amazingly toned back []

A single Loki episode is all thats left in the shows first season. After the fantastic developments in episode 5, next Wednesdays finale should deliver the final answers. Well get to see the last chapter of this new Lokis redemption journey. And well learn how the TV series will impact the upcoming MCU Phase 4 The post The answer to Marvels biggest Loki mystery might be hiding in plain sight appeared first on BGR.

The last few months of Donald Trumps presidency were marred by chaos and confusion after he lost the election. One of the key moments to highlight those tumultuous days involved Rudy Giuliani and his campaign to get the election results overturned amid his allegations of voter fraud. The message behind that press conference was completely []

The cast for "Bachelor in Paradise" season 7 has been revealed. The popular "Bachelor" spin-off -- which features fan favorites from both "The Bachelor" and "The Bachelorette" returning for another shot at love -- is finally back, with 19 contestants ready to find romance at a beachside Mexican resort. This is the first new season of "Bachelor in Paradise" to premiere in two years, as there was no 2020 season due to the COVID-19 pandemic.

Melania Trump is back in New York City, and her potential semi-permanent relocation now has her teenage son, Barron Trump, joining her for an outing in the Big Apple. The mother-son pair were spotted leaving their Manhattan home (Trump Tower, of course) this past week on July 7, and it looks the youngest Trump, who []

Rachel Nichols hosted her long-running afternoon TV show, "The Jump," Monday afternoon, and began with a brief apology: "I . . . don't want to let this moment pass without saying . . . how deeply, deeply sorry I am for disappointing those I hurt, particularly Maria Taylor," she said. It was a day after the New York Times published leaked audio from a private conversation Nichols had a year before, in which she suggested that Taylor, her colleague, would replace Nichols as host of the network's N

weird, rare clouds and the physics behind them | wired

weird, rare clouds and the physics behind them | wired

In August, we posted a photograph of some odd, rare clouds known as Morning Glory clouds without providing an explanation for how they form. In response to reader interest, we followed up with meteorologist Roger Smith of the University of Munich, who has studied their formation.

The Morning Glory phenomenon is the result of the particular configuration of the land and sea on the Cape York Peninsula, in a remote part of Australia. The peninsula tapers off from about 350 miles wide to 60 miles as it extends north between the Gulf of Carpentaria to the west and the Coral Sea to the east. The easterly trade winds push the sea breeze across the peninsula during the daytime, which meets the sea breeze from the west coast in the late evening. The collision produces a wave disturbance moving inland to the southwest that is a key part of the cloud formation.

If you look at the clouds, it looks as if they are rolling backwards, Smith said. But in fact the clouds are continuously formed at the leading edge and continuously eroded at the trailing edge. That gives a rolling appearance.

These clouds do occur elsewhere, including Munich, where they form about once in a decade. Cape York is unique because they happen regularly in the fall above the small town of Burketown. And they can also be particularly impressive there as well, growing up to 600 miles long. Pilots fly into the area every year, hoping to see the intriguing clouds.

Not many scientists study them, or really any weird clouds, because their very rarity makes them relatively unimportant for studying precipitation or climate. So, oftentimes, their formation is poorly understood.

Convection is like a buoyant bubble, he said. In mammutus clouds, evaporation causes pockets of negative buoyancy as it cools the air inside the cloud. This makes the clouds puff downward instead of up like cumulus clouds, and they end up being like upside-down bubbles.

The reason they are smooth is the thermal structure right below them. The speed at which the temperature drops with increased height, known as the "lapse rate," needs to be close to neutral, he said. In other words, if you put a warm little bubble of air in a particular spot, it won't go up or down much at all no heat goes in or out. This is typical of the thermal structure of thunderstorms. Without these circumstances, you'd get more common ragged-looking clouds or cloudy wisps coming out.

"You take your grandma's Cadillac and drive it over a speed bump, and after that it goes up and down for a while," he said. "The reason you are going down is because of gravity, and then there are springs in the suspension that push you back up."

In the case of lenticular clouds, the speed bump is usually some kind of topography, like a mountain, that gets in the way of air flow. As the air comes down the side of the mountain, it tends to overshoot and then springs back up. It oscillates like this for a while, and on the upward part of the waves, clouds form as rising air cools.

Lenticular clouds can also be caused by other speed bumps, such as tall thunderclouds, but because they often form on the downwind sides of mountains, they are also known as lee clouds, wave clouds or lee wave clouds.

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. Sometimes multiple ovals form that look like a stack of saucers.

These crazy clouds that look like a row of crashing waves are known as Kelvin-Helmholz waves. They form when two layers of air or liquid of different densities move past each other at different speeds, creating shearing at the boundary.

When these two layers move past each other, a Kelvin-Helmholz instability is formed that is sort of like a wave. Parts of the boundary move up and parts move down. Because one layer is moving faster than the other, the shear causes the tops of the waves to move horizontally, forming what looks like an ocean wave crashing on the beach.

This spectacular photo of the eruption of Sarychev Volcano in the Kuril Islands, northeast of Japan on June 12 shows an interesting example of a pileus cloud. The ash plume appears to have a smooth white cap on it as it breaks through the cloud cover above.

This type of cloud is caused by strong, relatively fast upward motion. Situations where this occurs include quickly growing thunderheads, volcanic eruptions and even nuclear explosions. In each case, something pushes warm, moist air upward quickly.

"You can see them very commonly above thunderstorms storms, and that's because the air is moving so rapidly up there that the air flow gets perturbed above it," Breed said. "And as soon as it cools enough for a cloud to form, you get these cloud caps."

"If you have very strong convection, pushing quickly and very high, it forms more of an ice cloud because it is high enough for the crystals to freeze," Chuang said. "It's nothing more mysterious than things freezing."

These "night shining" clouds are formed by ice at the boundary of Earths atmosphere and space, 50 miles high. They shine because they are so high they remain lit by the sun even after it has gone below the horizon. Its not clear why these clouds have migrated down from the poles, or why more of them are appearing in the polar regions, too, and shining more brightly.

The clouds form at temperatures around minus-230 degrees Fahrenheit, when dust blowing up from below or falling into the atmosphere from space provides surfaces for water vapor to condense on and freeze. Right now, during the northern hemispheres summer, the atmosphere is heating up and expanding. At the outside edge of the atmosphere, that actually means that its getting colder because its pushed farther out into space.

The prevailing theory and most plausible explanation is that CO2 buildup, at 50 miles above the surface, would cause the temperature decrease, said James Russell, an atmospheric scientist at Hampton University and the principal investigator of an ongoing NASA satellite mission to study the clouds. He cautioned, however, that temperature observations remain inconclusive.

Roll clouds typically occur in the lower atmosphere ahead of a storm front. Warm updrafts in the storm front push cold air up, which then flows down along the sides of the updraft. The cold downdraft then bounces back up a bit setting up a wave-like structure in front of the storm.

On the upswing, the cold air forms a cloud. Evaporation of the cloud causes a downdraft on the edges that erodes the cloud, forming a roll. If the wave continues, a series of roll clouds, called a street, can form.

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rare weather phenomenon called a

rare weather phenomenon called a "roll cloud" spotted near athens

A spectacular weather phenomenon called a roll cloud was spotted north of Athens by a group of amateur meteorologists on Monday as rainstorms hit the Greek capital. The group Forecast Weather, which says that this was the first time that they had ever observed such a phenomenon in Greece, took photos of the bizarre cloud formation at Afidnes early on Monday afternoon. A roll cloud is a low, horizontal, tube-shaped, and relatively rare type of arcus cloud. They differ from shelf clouds by being completely detached from other cloud features. Roll clouds usually appear to be literally rolling endlessly around a horizontal axis. The remarkable formations are a type of solitary cloud called a soliton, a wave-shaped structure having a single crest which moves along without changing its speed or its unusual shape.

See all the latest news from Greece and the world at Greekreporter.com. Contact our newsroom to report an update or send your story, photos and videos. Follow GR on Google News and subscribe here to our daily email!

'fognado' in santa cruz was a roll cloud, meteorologists say

'fognado' in santa cruz was a roll cloud, meteorologists say

KSBW Facebook fan Ingrid Schmidt-Wagnaar said, "All of a sudden the trees were bending. It was over in less than three minutes, and blue sky was again upon us, and it got warm again. Nature's phenomenon."

The National Weather Service defines a roll cloud as, "A low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front (or sometimes with a cold front). Roll clouds are relatively rare; they are completely detached from the thunderstorm base or other cloud features, thus differentiating them from the more familiar shelf clouds. Roll clouds usually appear to be "rolling" about a horizontal axis, but should not be confused with funnel clouds."

3 ingredient keto cloud bread recipe (oopsie bread) | wholesome yum

3 ingredient keto cloud bread recipe (oopsie bread) | wholesome yum

By Maya Krampf 307 Comments Save PIN RATE RECIPE TO RECIPE Full ingredients + instructions are on the recipe card at the end. Before you scroll or jump down, don't miss the useful tips in the post!

I first made this easy 3 ingredient cloud bread recipe about 5 years ago, and while Ive since made lots of other keto bread recipes, I still make this one regularly its so easy, fluffy, and light. Whether you call it keto cloud bread or oopsie bread or oopsie rolls, these are all names for this same delicious low carb bread. Another huge plus is youll only need common ingredients you probably have on hand, which is super convenient.

I originally posted this cloud bread recipe together with an announcement that we were expecting my second little girl. While it sure brings back fond memories, it seems strange for me to rehash that several years later. And lets face it, Im sure what you really want to know is how to make cloud bread, not the story of my life during that time.

So lets just suffice to say, even my kids happen to love this bread, which says a lot about how good it is. While its pretty common on a keto diet, I made one little tweak that I believe makes this the best cloud bread recipe. Try it and see what you think!

This oopsie bread recipe was originally published on October 15, 2016, and the post was republished in April 2021 to add updated and step-by-step photos, updated final photos, useful tips, and answers to common questions.

If for whatever reason this isnt your thing, try my paleo keto bread, keto bagels or almond flour bread. Or, check out my entire collection of low carb bread recipes. Im sure youll find one you like.

As far as I can tell, the original no carb cloud bread recipe came fom Your Lighter Side. The story goes that they are called low carb oopsie rolls because they came about by accident. Oops! Apparently, the recipe author was trying to make something else entirely. Funny how that works!

Oopsie bread is similar to a very light and fluffy white bread. The texture is airy (you can see it in the image below). It doesnt have a lot of flavor on its own (maybe just a hint of egg), which makes it that much easier to use on sandwiches.

For a long time, I would just make the usual easy cloud bread with cream cheese. Because I love mascarpone so much, I decided to give that a try one day and I liked it even better. Now I always prefer to use mascarpone in my cloud bread recipe it gives it a more neutral, buttery flavor.

The other ingredient I highly recommend for making oopsie bread is cream of tartar. This is a powdery acid that helps stabilize the egg whites, so that its easier to beat them to stiff peaks. But, its optional and you can still make cloud bread without it!

FYI: This would be the step where a typical cloud bread recipe would use cream cheese, and we are using mascarpone instead. Really, you can use either one that you have! I hope youll at least try the mascarpone to compare.

I'm Maya Krampf - cookbook author, recipe developer, writer, photographer, and low carb advocate. My keto blog features natural keto recipes, as well as healthy proteins and veggies for everyone -- all with 10 ingredients or less!

ufo? bizarre 'roll cloud' in tennessee stuns residents | fox news

ufo? bizarre 'roll cloud' in tennessee stuns residents | fox news

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Hutton sent the picture toWMC-TV in Memphis, hoping meteorologists at the news station would be able to identify the rare sight. Last week, WMC-TV confirmed the eerie scene was not a UFO after all it's actually a roll cloud.

"Roll clouds are relatively rare; they are completely detached from the thunderstorm base or other cloud features, thus differentiating them from the more familiar shelf clouds," the National Weather Service (NWS) explains in a post online. "Roll clouds usually appear to be 'rolling' about a horizontal axis, but should not be confused with funnel clouds."

NWS Memphis said it resembled a"rolling pin moving through the sky" in a Facebook post earlier this month, which has been shared by hundreds of people. Dozens of people commented on the jaw-dropping photo some even sharing stunning views of their own.

This material may not be published, broadcast, rewritten, or redistributed. 2021 FOX News Network, LLC. All rights reserved. Quotes displayed in real-time or delayed by at least 15 minutes. Market data provided by Factset. Powered and implemented by FactSet Digital Solutions. Legal Statement. Mutual Fund and ETF data provided by Refinitiv Lipper.

breakdown: why roll clouds are unique formations

breakdown: why roll clouds are unique formations

While the clouds look ominous, in reality a process in the sky is occurring creating what is known as a roll cloud. In this episode of the Breakdown, we will explain how these clouds form and why they are not dangerous.

Roll clouds can sometimes form in advance of the shelf cloud when a horizontal vortex forms in the atmosphere. It can then become detached from the structure as the storm decays and continue moving along appearing to be rolling horizontally across the sky.

They are typically found along coastal regions resulting from a sea breeze or cold front. The picture we received was a result of storms that had been moving through the area the day the photo was taken.

As the storms decayed, the downdraft combined with forward movement and gravity to produce the giant roll cloud that moved through the Mid-South making for a uniquely beautiful yet, somewhat shocking sight for those who saw it.

picture of the day: open water roll cloud twistedsifter

picture of the day: open water roll cloud twistedsifter

This impressive (and seemingly endless) roll cloud was spotted from a ship en route from Paranagua, Brazil to Montevideo, Uruguay. The image was taken by Capt. Andreas M. van der Wurff and chosen as the Earth Science Picture of the Day for February 29, 2012.

A cloud feature like this isnt something you would want to run into on the open sea or on a crowded highway, but roll clouds (arcus cloud) arent necessarily a presage of severe weather. They most often form along the leading edge of a mature thunderstorm in the relatively cool air associated with the storms downdraft; however, theyre detached from the storm itself and may be seen to roll or tumble along their horizontal axis.

This isnt the first time a roll cloud has been featured as a POTD (see here and here) or in a standalone post. If you enjoy looking at various cloud formations, be sure to check out the clouds tag on the Sifter!

15 incredible cloud formations twistedsifter

15 incredible cloud formations twistedsifter

The skies have always been a constant source of fascination for humans. One common mass that everyone on the planet has seen in one form or another are clouds. They can come in all sizes, shapes, and colours; and their distinct formations have been studied by meteorologists for centuries. Below you will find a collection of 15 fascinating and incredible cloud formations. Enjoy!

Lenticular clouds (Altocumulus lenticularis) are stationary lens-shaped clouds that form at high altitudes, normally aligned perpendicular to the wind direction. Lenticular clouds can be separated into altocumulus standing lenticularis (ACSL), stratocumulus standing lenticular (SCSL), and cirrocumulus standing lenticular (CCSL). Due to their shape, they have been offered as an explanation for some Unidentified Flying Object (UFO) sightings. Where stable moist air flows over a mountain or a range of mountains, a series of large-scale standing waves may form on the downwind side. If the temperature at the crest of the wave drops to the dew point, moisture in the air may condense to form lenticular clouds. As the moist air moves back down into the trough of the wave, the cloud may evaporate back into vapor. [Source: Wikipedia]

Undulatus asperatus (or alternately, asperatus) is a cloud formation, proposed in 2009 as a separate cloud classification by the founder of the Cloud Appreciation Society. If successful it will be the first cloud formation added since cirrus intortus in 1951 to the International Cloud Atlas of the World Meteorological Organization. The name translates approximately as roughened or agitated waves The clouds are most closely related to undulatus clouds.[3] Although they appear dark and storm-like, they tend to dissipate without a storm forming. The ominous-looking clouds have been particularly common in the Plains states of the United States, often during the morning or midday hours following convective thunderstorm activity. [Source: Wikipedia]

Night clouds or noctilucent clouds are tenuous cloud-like phenomena that are the ragged-edge of a much brighter and pervasive polar cloud layer called polar mesospheric clouds in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. The name means roughly night shining in Latin. They are most commonly observed in the summer months at latitudes between 50 and 70 north and south of the equator. They are the highest clouds in the Earths atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres (47 to 53 mi). They are normally too faint to be seen, and are visible only when illuminated by sunlight from below the horizon while the lower layers of the atmosphere are in the Earths shadow. Noctilucent clouds are not fully understood and are a recently discovered meteorological phenomenon; there is no record of their observation before 1885. Noctilucent clouds can form only under very restrictive conditions; their occurrence can be used as a sensitive guide to changes in the upper atmosphere. Since they are a relatively recent classification, the occurrence of noctilucent clouds appears to be increasing in frequency, brightness and extent. It is theorized that this increase is connected to climate change. [Source: Wikipedia]

A fallstreak hole, also known as a hole punch cloud, punch hole cloud, canal cloud or cloud hole, is a large circular gap that can appear in cirrocumulus or altocumulus clouds. Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation particles. When a portion of the water does start to freeze it will set off a domino effect, due to the Bergeron process, causing the water vapor around it to freeze and fall to the earth as well. This leaves a large, often circular, hole in the cloud. It is believed that a disruption in the stability of the cloud layer, such as that caused by a passing jet, may induce the domino process of evaporation which creates the hole. Such clouds are not unique to any one geographic area and have been photographed from the United States to Russia. Because of their rarity and unusual appearance, fallstreak holes are often mistaken for or attributed to unidentified flying objects. [Source: Wikipedia]

Mammatus, also known as mammatocumulus (meaning mammary cloud or breast cloud), is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud. The name mammatus, derived from the Latin mamma (meaning udder or breast), refers to a resemblance between the characteristic shape of these clouds and the breast of a woman. Mammatus are most often associated with the anvil cloud and also severe thunderstorms. They often extend from the base of a cumulonimbus, but may also be found under altocumulus, altostratus, stratocumulus, and cirrus clouds, as well as volcanic ash clouds. [Source: Wikipedia]

A wave cloud is a cloud form created by atmospheric internal waves. The atmospheric internal waves that form wave clouds are created as stable air flows over a raised land feature such as a mountain range, and can form either directly above or in the lee of the feature. As an air mass travels through the wave, it undergoes repeated uplift and descent. If there is enough moisture in the atmosphere, clouds will form at the cooled crests of these waves. In the descending part of the wave, those clouds will evaporate due to adiabatic heating, leading to the characteristic clouded and clear bands. The cloud base on the leeward side is higher than on the windward side, because precipitation on the windward side removes water from the air. It is possible that simple convection from mountain summits can also form wave clouds. This occurs as the convection forces a wave or lenticular wave cloud into the more stable air above. [Source: Wikipedia]

Cloud iridescence is the occurrence of colors in a cloud similar to those seen in oil films on puddles, and is similar to irisation. It is a fairly uncommon phenomenon, most often observed in altocumulus, cirrocumulus and lenticular clouds, and very rarely in Cirrus clouds. The colors are usually pastel, but can be very vivid. Iridescence is generally produced near the sun, with the suns glare masking it, so it is more easily seen by hiding the sun behind a tree or building. Other aids are dark glasses, or observing the sky reflected in a convex mirror or in a pool of water. Iridescent clouds are a diffraction phenomenon cause by small water droplets or small ice crystals individually scattering light. Larger ice crystals produce halos, which are a refraction phenomena rather than iridescence. Iridescence should similarly be distinguished from the refraction in larger raindrops that makes a rainbow. If parts of clouds have small droplets or crystals of similar size, their cumulative effect is seen as colors. The cloud must be optically thin, so that most rays encounter only a single droplet. Iridescence is therefore mostly seen at cloud edges or in semi-transparent clouds, and newly forming clouds produce the brightest and most colorful iridescence. When a thin cloud has droplets of similar size over a large extent, the iridescence takes on the structured form of a corona, a central bright disk around the sun or moon surrounded by one or more colored rings. [Source: Wikipedia]

A roll cloud is a low, horizontal, tube-shaped, and relatively rare type of arcus cloud. They differ from shelf clouds by being completely detached from other cloud features. Roll clouds usually appear to be rolling about a horizontal axis. They are a solitary wave called a soliton, which is a wave that has a single crest and moves without changing speed or shape. One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia. One of the main causes of the Morning Glory cloud is the mesoscale circulation associated with sea breezes that develop over the Cape York peninsula and the Gulf of Carpentaria. However, similar features can be created by downdrafts from thunderstorms and are not exclusively associated with coastal regions. Coastal roll clouds have been seen over California, the English Channel, Shetland Islands, Lithuania, Eastern Russia, other maritime regions of Australia, off the Mexican coast in the Sea of Cortez, Uruguay, in the Canadian provinces of Nova Scotia and Ontario, and Campos dos Goytacazes and Coronel Vivida bay in Brazil. [Source: Wikipedia]

A shelf cloud is a low, horizontal, wedge-shaped arcus cloud. A shelf cloud is attached to the base of the parent cloud, which is usually a thunderstorm. Rising cloud motion often can be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent and wind-torn. Cool, sinking air from a storm clouds downdraft spreads out across the land surface, with the leading edge called a gust front. This outflow cuts under warm air being drawn into the storms updraft. As the lower cooler air lifts the warm moist air, its water condenses, creating a cloud which often rolls with the different winds above and below (wind shear). People seeing a shelf cloud may believe they have seen a wall cloud. This is a likely mistake, since an approaching shelf cloud appears to form a wall made of cloud. A shelf cloud usually appears on the leading edge of a storm, and a wall cloud will usually be at the rear of the storm. [Source: Wikipedia]

A pyrocumulus, or fire cloud, is a dense cumuliform cloud associated with fire or volcanic activity. A pyrocumulus is similar dynamically in some ways to a firestorm, and the two phenomena may occur in conjunction with each other. However, one may occur without the other. A pyrocumulus cloud is produced by the intense heating of the air from the surface. The intense heat induces convection which causes the air mass to rise to a point of stability, usually in the presence of moisture. Phenomena such as volcanic eruptions, forest fires, and occasionally industrial activities can induce formation of this cloud. The detonation of a nuclear weapon in the atmosphere will also produce a pyrocumulus in the form of a mushroom cloud which is made by the same mechanism. The presence of a low level jet stream can enhance its formation. Condensation of ambient moisture (moisture already present in the atmosphere) as well as moisture evaporated from burnt vegetation or volcanic outgassing occurs readily on particles of ash. [Source: Wikipedia]

In meteorology, lee waves are atmospheric standing waves. Both lee waves and the rotor may be indicated by specific wave cloud formations if there is sufficient moisture in the atmosphere, and sufficient vertical displacement to cool the air to the dew point. Waves may also form in dry air without cloud markers. Wave clouds do not move downwind as clouds usually do, but remain fixed in position relative to the obstruction that forms them. Adiabatic compression heating in the trough of each wave oscillation may evaporate cumulus or stratus clouds in the airmass, creating a wave window or Foehn gap [Source: Wikipedia].

An actinoform or actiniform cloud is a collection of marine low clouds that takes a distinct shape. They are named after the Greek word for ray due to their radial structure. Actinoform clouds can spread out over 300 kilometers (190 mi) across and thus cannot be easily seen with the naked eye. In addition, actinoform clouds can form trains that are up to six times the length of the original cloud field, yet they maintain their own, distinct identity. In a satellite image, they look like distinct leaf-like or spokes-on-a-wheel patterns that stand out from the rest of the low-lying cloud field. However, why they have this shape or how they are formed is not known, but recent evidence suggests that the interaction of both radiation and precipitation may help to organize them on the mesoscale. The individual convective cells that collectively make up an actinoform cloud are quite shallow, with heights generally less than 2 km, and would be classified as stratocumulus clouds by an observer on the ground. Given the extensive mesoscale organization of these clouds, it is appropriate to describe them as mesoscale stratocumulus cloud systems (MSCS) in analogy with their deeper counterpart, the Mesoscale convective system. [Source: Wikipedia]

Polar stratospheric clouds or PSCs, also known as nacreous clouds, are clouds in the winter polar stratosphere at altitudes of 15,00025,000 meters (49,00082,000 ft). They are implicated in the formation of ozone holes; their effects on ozone depletion arise because they support chemical reactions that produce active chlorine which catalyzes ozone destruction, and also because they remove gaseous nitric acid, perturbing nitrogen and chlorine cycles in a way which increases ozone destruction. The stratosphere is very dry; unlike the troposphere, it rarely allows clouds to form. In the extreme cold of the polar winter, however, stratospheric clouds of different types may form, which are classified according to their physical state and chemical composition. [Source: Wikipedia]

A pileus, also called scarf cloud or cap cloud, is a small, horizontal, altostratus cloud that can appear above a cumulus or cumulonimbus cloud, giving the parent cloud a characteristic hoodlike appearance. They are formed by strong updrafts acting upon moist air at lower altitudes, causing the air to cool to its dew point. As such, they are usually indicators of severe weather, and a pileus found atop a cumulus cloud often foreshadows transformation into a cumulonimbus cloud, as it indicates a strong updraft within the cloud. Clouds that are attached to pilei are often given the suffix pileus or with pileus. For example, a cumulonimbus cloud with a pileus attached to it would be called cumulonimbus with pileus. Pilei can also form above ash clouds and pyrocumulus clouds from erupting volcanoes (see the image above). They can also form above some mushroom clouds of high-yield nuclear detonations; in that context they are called ice caps. [Source: Wikipedia]

The Morning Glory cloud is a rare meteorological phenomenon occasionally observed in different locations around the world. The southern part of Northern Australias Gulf of Carpentaria is the only known location where it can be predicted and observed on a more or less regular basis. The settlement of Burketown attracts glider pilots intent on riding this phenomenon. Morning Glory clouds can most often be observed in Burketown in September to mid-November, when the chance to see it early in the morning is approximately 40%. A Morning Glory cloud is a roll cloud that can be up to 1,000 kilometres (620 mi) long, 1 to 2 kilometres (0.62 to 1.2 mi) high, often only 100 to 200 metres (330 to 660 ft) above the ground and can move at speeds up to 60 kilometres (37 mi) per hour. Sometimes there is only one cloud, sometimes there are up to eight consecutive roll clouds. The Morning Glory is often accompanied by sudden wind squalls, intense low-level wind shear, a rapid increase in the vertical displacement of air parcels, and a sharp pressure jump at the surface. In the front of the cloud, there is strong vertical motion that transports air up through the cloud and creates the rolling appearance, while the air in the middle and rear of the cloud becomes turbulent and sinks. The cloud can also be described as a solitary wave or a soliton, which is a wave that has a single crest and moves without changing speed or shape. [Source: Wikipedia]

texas 'roll cloud' looks ominous in weather service photo - cnet

texas 'roll cloud' looks ominous in weather service photo - cnet

You could go your whole life and never see a rare "roll cloud" in person, but the US National Weather Service office in San Angelo, Texas, snapped a photo of the strange formation in the sky and posted it to social media Monday.

Parts of west central Texas were treated to a fairly rare and well-formed "Roll Cloud" moving through the area this morning, as a cold front swept through. Here is what it looked like from the NWS Office in San Angelo. Feel free to reply with your own images! #txwx pic.twitter.com/wc1FpKATr9

"These rare long clouds may form near advancing cold fronts. In particular, a downdraft from an advancing storm front can cause moist warm air to rise, cool below its dew point, and so form a cloud,"NASA explains.

TheFacebook version of the NWS photo lets you explore the space in 360, which is the next best thing to being there. Weather-watching Texas residents described the cloud in the comments as stunning, cool and "kinda weird."

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