10 Rarest Cloud Formations Caught On Camera

Clouds fill the skies above us and are part of our every day lives but often go unnoticed. Clouds come in many shapes and sizes, but some formations are so rare that they almost seem otherworldly. These unusual clouds typically require very specific atmospheric conditions to form and are a spectacle for those lucky enough to witness them reminding us of the intricacies of nature’s beauty and the complex interactions of the atmosphere. Along with running Cool Things Collection, I’m also a full time professional wedding photographer in Cornwall – South West England, and i’m always looking for dramatic skies/clouds for the backdrop to my images but haven’t yet witnessed a rare cloud formation. This is a list of the 10 rarest cloud formations in no particular order that for those lucky enough to see them, were caught on camera.

Nacreous Clouds (mother of pearl clouds)

These rare clouds, sometimes called mother-of-pearl clouds are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. They have iridescent colours but are higher and much rarer than ordinary iridescent clouds. They are seen mostly but not exclusively in polar regions and in winter at high latitudes, Scandinavia, Alaska, Northern Canada. Lower level iridescent clouds can be seen anywhere. Nacreous clouds shine brightly in high altitude sunlight up to two hours after ground level sunset or before dawn. Their unbelievably bright iridescent colours and slow movement relative to any lower clouds make them an unmistakable and unforgettable sigh

 

Nacreous Clouds

 

Mammatus Clouds

Mammatus Clouds are a dramatic, rare formation characterized by pouch-like bulges that hang down from the base of a storm cloud. These clouds are often associated with severe thunderstorms, and while they don’t necessarily indicate a tornado, they do signify powerful atmospheric instability. Mammatus is a Latin term meaning “mother’s breast,” and the clouds can look almost surreal, like a sky full of upside-down pouches or sacs.

 Mammatus Clouds

 

Altocumulus Castelanus (jellyfish clouds)

Also known as jellyfish clouds due to their jellyfish-like appearance. These formed around 17,000 ft due to when the rush of moist air comes from the Gulf Stream and gets trapped between layers of dry air. The top of the cloud rises into a jellyfish shape and long tentacles known as “trailing virga” form from rain drops that have evaporated.

 

Noctilucent Clouds

One of the rarest cloud types, noctilucent clouds, appear high in the mesosphere, about 50 miles above the Earth’s surface. These clouds are made of ice crystals and are visible only during twilight, when the sun is below the horizon but still illuminates them from below. They have a ghostly, blue glow, and are most commonly seen in polar regions during the summer months. Their formation is influenced by a delicate balance of moisture, temperature, and high-altitude winds.

 

Noctilucent Clouds

Mushroom Clouds

A mushroom cloud is a distinctive mushroom-shaped cloud of smoke, condensed water vapour, or debris resulting from a very large explosion. They are most commonly associated with nuclear explosions, but any sufficiently large blast will produce the same sort of effect. Volcano eruptions and impact events can produce natural mushroom clouds. Mushroom clouds as a result of the sudden formation of a large mass of hot low-density gases near the ground creating a Rayleigh-Taylor instability. The mass of gas rises rapidly, resulting in turbulent vortices curling downward around its edges and drawing up a column of additional smoke and debris in the centre to form its “stem”. The mass of gas eventually reaches an altitude where it is no longer less dense than the surrounding air and disperses, the debris drawn upward from the ground scattering and drifting back down.

 

Mushroom Clouds

 

Cirrus Kelvin-Helmholtz

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.

 

Cirrus Kelvin-Helmholtz

 

7. Lenticular Clouds

Lenticular Clouds are lens-shaped clouds that form over mountain ranges due to air currents being forced up and over the peaks. These clouds can appear as stationary saucers or pancakes, and are often mistaken for UFOs due to their distinctive shape. They are more commonly found in areas with strong winds and topography that disrupts airflow. Technically known as altocumulus standing lenticularis are stationary lens-shaped clouds that form at high altitudes, normally aligned at right-angles to the wind direction. 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. Lenticular clouds sometimes form at the crests of these waves. Under certain conditions, long strings of lenticular clouds can form, creating a formation known as a wave cloud. Lenticular clouds are popular with UFO believers because they often look like flying saucers. The lens-shaped clouds form at high altitude and are usually formed when moist air passes over a mountain range and is heated adiabatically (that is, without any transference of heat energy) as it descends. The cloud pattern depends upon the wind speed and the shape of the mountains. A constant wind may produce clouds which are stable and remain virtually stationary in the sky for long periods.

 

Lenticular Clouds

 

8. Roll Clouds & Morning Glory Clouds

A roll cloud is a low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front, or sometimes a cold front. Roll clouds can also be a sign of possible microburst activity. Cool air sinking air from a storm cloud’s downdraft spreads out across the surface with the leading edge called a gust front. This outflow undercuts warm air being drawn into the storm’s updraft. As the cool air lifts the warm moist air water condenses creating cloud, which often rolls with the different winds above and below (wind shear). Roll clouds are basically shelf clouds without attachment to a thunderstorm.

Morning Glory cloud is a rare meteorological phenomenon occasionally observed in different locations around the world. The southern part of Northern Australia’s Gulf of Carpentaria is the only known location where it can be predicted and observed on a more or less regular basis due to the configuration of land and sea in the area. The settlement of Burketown attracts glider pilots intent on riding this phenomenon.

 

Roll Cloud

 

Shelf Clouds

A shelf cloud is a low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with a cold front, even in the absence of thunderstorms). Unlike a roll cloud, a shelf cloud is attached to the base of the parent cloud above it (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, boiling, and wind-torn.

Undulatus Asperatus Clouds

Undulatus 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 Organisation. The name translates approximately as “roughened or agitated waves”.

 

Undulatus Asperatus Clouds

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