In meteorology, a cloud is an aerosol comprising a visible mass of liquid droplets or frozen crystals made of water or various chemicals. The droplets or particles are suspended in the atmosphere above the surface of a planetary body. Terrestrial cloud formation is the result of air in any of the lower three principal layers of Earth's atmosphere (collectively known as the homosphere) becoming saturated due to either or both of two processes: cooling of the air and adding water vapor.

Cloud types in the troposphere, the atmospheric layer closest to Earth's surface, have Latin names due to the universal adaptation of Luke Howard's nomenclature. It was formally proposed in December 1802 and published for the first time the following year. It became the basis of a modern international system that classifies these tropospheric aerosols into several physical forms which can be found at various altitude levels or étages.

One physical form appears as non-convective stratiform sheets in stable air. If the airmass is slightly or partly unstable, limited-convective stratocumuliform rolls or ripples may appear. Both these layered forms have low, middle, and high-étage variants. Cloud types in the two upper étages are identified respectively by the prefixes alto- and cirro-. Thin or occasionally dense cirriform filaments are found only at high altitudes of the troposphere and may form in stable or partly unstable air. More generally unstable air tends to favor the formation of free-convective low or multi-level cumuliform heaps. Strong airmass instability or cyclonic lift can produce storm clouds with significant vertical extent through more than one étage. Prefixes are then used whenever necessary to express variations or complexities in their physical structures. These include cumulo- for complex highly unstable cumulonimbiform thunder clouds, and nimbo- for stable multi-étage stratiform layers with sufficient vertical depth to produce moderate to heavy precipitation. This cross-classification of forms and étages produces ten basic genus-types or genera, most of which can be divided into sub-types consisting of species that are often subdivided into varieties where applicable.

Clouds that form above the troposphere have common names for their main types, but are sub-classified alpha-numerically rather than with the elaborate system of Latin names given to cloud types in the troposphere. Clouds have been observed on other planets and moons within the Solar System, but, due to their different temperature characteristics, they are often composed of other substances such as methane, ammonia, and sulfuric acid as well as water.

Clouds Sky Landscape

I did not know what to draw so liar linked me a beautiful picture her took. Mine does not do his...

Nature Mountain Clouds Fuji-san Sunrise Sun Landscape

Drawing on SketchPort is a good way to distract myself from nervous stomach.

Windmill Netherland Kinderdijk Sunset Clouds Sky Landscape

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Landscape Sky Clouds

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SeA Sky Vat Is This ! Plop Clouds

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Airship Lighthouse Clouds Sun

For one of the similarly named Finish the Sky challenges. People were drawing airships so I...

Landscape Beach Water Clouds

Pinney's Beach, Nevis W.I Based on a picture I took while on vacation.

Clouds Sun Sky Nature Landscape

Failed failed... Tried to draw clouds with fill tool._. I added reflection at first, but because...

Clouds Landscape Moutains

My attempt at a sky. I think it looks weird but oh well lol. Thanks Aya for the tips :) Enjoy :3

Clouds Sky

My last drawing for the year! Based on a photo taken by nikko. see it here!

Sky Clouds

Ag told me to draw a grey and peach sky. I hope that you like lol. Thanks nikko for the name

Landscape Sand Clouds Desert

Just a quick landscape practice. Finally can go home for today... Stayed for 2 nights at office ._.

Autumn Tree Sky Clouds Leaves Cliff Nature Fall

an early birthday gift for my beloved brother even if he's not here anymore ^^

"Better by far to embrace the hard truth than a reassuring fable."
Carl Sagan
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