Cumulus clouds look like white puffy balls of cotton. Clouds are fun to watch and think about. The side of the mountains … That varies a lot, depending on atmospheric conditions. Cumulus clouds are vertical and thick. These droplets are condensed to form clouds. The warm, moist air rises and cools, eventually condensing into a cumulus cloud. , Some cumuliform and stratocumuliform clouds have been discovered on most other planets in the solar system. One of the most favored clouds among skywatchers is the cumulus cloud. If convection reaches a certain level the RH reaches one hundred percent, and the "wet-adiabatic" phase begins. Altocumulus clouds are known for bringing thunderstorms during warm weather. Both types of clouds have different impacts on the climate and could respond differently to climate change. They are often composed of mostly water droplets. Cumulus clouds are puffy clouds that sometimes look like pieces of floating cotton. Clouds are formed when moist, warm air rises and expands in the atmosphere.  Stratocumulus clouds can produce drizzle, which stabilizes the cloud by warming it and reducing turbulent mixing. , The liquid water density within a cumulus cloud has been found to change with height above the cloud base rather than being approximately constant throughout the cloud. The bottom of cumulus clouds are fairly close to the ground. These clouds are usually found anywhere between 2,000 to 30,000 feet above the ground, and they’re created by the ashes of volcanic eruptions and fire, as well as water vapor. Langmuir was able to develop a formula[note 1] which predicted that the droplet radius would grow unboundedly within a discrete time period. These two processes are how clouds form. Cumulus clouds are probably the most well-known of the cloud types.  The more vertical cumulus congestus species and cumulonimbus genus of clouds grow high into the atmosphere, carrying moisture with them, which can lead to the formation of cirrus clouds. Their name derives from the Latin cumulo-, meaning heap or pile. They are halfway up and in general they are a sign of good weather although in some occasions they can … These species may be arranged into the variety, cumulus radiatus; and may be accompanied by up to seven supplementary features, cumulus pileus, velum, virga, praecipitatio, arcus, pannus, and tuba. They can be gray. Now, let’s talk about how clouds form in the first place. BQ: I've read websites that say when water vapor reaches its saturation point, WHAT IS A SATURATION POINT? The top of the cloud has rounded towers.  These clouds do not last long, and they tend to change into cirrus because as the water vapor continues to deposit on the ice crystals, they eventually begin to fall, destroying the upward convection. They are formed as a result of the process of convection, wherein warm air rises in the atmosphere and eventually cools down. They are those that are at a higher altitude, exceed 7,500 meters in height, and are formed by tiny ice crystals. Cumulonimbus (from Latin cumulus, "heaped" and nimbus, "rainstorm") is a dense, towering vertical cloud, forming from water vapor carried by powerful upward air currents. The other clouds in this level are cirrus and cirrostratus. As they grow much taller than a cumulus cloud, they can occur at altitudes up to 50,000 feet. The bunch of water vapor, droplets and ice crystals are called as ‘cloud’. How do cirrocumulus clouds form?  Cumuliform clouds have also been detected on Saturn.  In the accretion phase, the raindrop begins to fall, and other droplets collide and combine with it to increase the size of the raindrop. Cumulonimbus clouds, commonly called thunderheads, can produce high winds, torrential rain, lightning, gust fronts, waterspouts, funnel clouds, and tornadoes. Cumulus clouds are white, puffy clouds that look like pieces of floating cotton. Additionally, stratocumulus clouds reflect a large amount of the incoming sunlight, producing a net cooling effect. Langmuir writes that surface tension in the water droplets provides a slightly higher pressure on the droplet, raising the vapor pressure by a small amount.  Glider pilots often pay close attention to cumulus clouds, as they can be indicators of rising air drafts or thermals underneath that can suck the plane high into the sky—a phenomenon known as cloud suck. Cumulus Clouds Cumulus clouds are white, puffy clouds that look like pieces of floating cotton. Altocumulus are made up of a mix of ice and water, giving them a slightly more ethereal appearance than the big and fluffy lower level Cumulus clouds form via atmospheric convection as air warmed by the surface begins to rise. As the air rises, the temperature drops (following the lapse rate), causing the relative humidity (RH) to rise. ", "Cloud Classifications and Characteristics", "Common Cloud Names, Shapes, and Altitudes", "An incredibly rare 'horseshoe cloud' was spotted in Nevada and it kept the meme-makers busy", "NASA SP-441: Viking Orbiter Views of Mars", "Mysterious Cyclones Seen at Both of Saturn's Poles", "Check Out The Most Richly Detailed Image Ever Taken Of Uranus", "The Vertical Profile of Liquid and Ice Water Content in Midlatitude Mixed-Phase Altocumulus Clouds", "A Model of the Effect of Cumulus Clouds on the Redistribution and Transformation of Pollutants", "Convective formation of pileus cloud near the tropopause", "The Production of Rain by a Chain Reaction in Cumulus Clouds at Temperatures Above Freezing", 10.1175/1520-0469(1948)005<0175:TPORBA>2.0.CO;2, "Entrainment of Air Into a Cumulus Cloud", 10.1175/1520-0469(1947)004<0091:EOAIAC>2.0.CO;2, "The Micro structure of Cumulus Cloud. Cumulus clouds have vertical growth. What are cumulus clouds?  Cumulus humilis clouds look like puffy, flattened shapes. Stratus clouds may turn into cumulus or cirrus clouds are air masses and moisture rise higher into the atmosphere.  Cumulus clouds are low-level clouds, generally less than 2,000 m (6,600 ft) in altitude unless they are the more vertical cumulus congestus form. The level in the troposphere the convection occurs and how deep the convection is will determine the type of cumulus cloud. Cumulus mediocris clouds look similar, except that they have some vertical development. However, at the same time, they heat the earth by around 7 °C (13 °F) by reflecting emitted radiation, an effect largely caused by cirrus clouds. The warm air filled with water vapour starts to rise. They commonly appear in regular, rippling patterns or in rows of clouds with clear areas between. Cumulus virga clouds are cumulus clouds producing virga (precipitation that evaporates while aloft), and cumulus praecipitatio produce precipitation that reaches the Earth's surface. This forms water vapour. A stratocumulus cloud is another type of stratocumuliform cloud. Cumulus clouds are part of the larger category of free-convective cumuliform clouds, which include cumulonimbus clouds. Cumulus clouds are formed when rising warm air meets a body of cool air. As a result, they flatten out like stratus clouds, giving them a layered appearance.  During the convection, surrounding air is entrained (mixed) with the thermal and the total mass of the ascending air increases.  Being a cloud of limited convection, stratocumulus is divided into three species; stratiformis, lenticularis, and castellanus, that are common to the higher stratocumuliform genus-types.  Cumulus pileus clouds refer to cumulus clouds that have grown so rapidly as to force the formation of pileus over the top of the cloud. Those particles provide surfaces on which water vapor can change into liquid droplets or ice crystals. This creates the characteristic flat-bottomed puffy shape associated with cumulus clouds. As air heated at the surface is lifted, it cools and water vapour condenses to produce the cloud.Throughout the day, if conditions allow, these can grow in height and size and can eventually form into cumulonimbus clouds. The base of cumulus clouds are generally flat and occurs at the altitude where the moisture in rising air condenses. Cumulus clouds have sharp outlines and a flat base at a height of 1000m. Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. The puffy, fluffy, whimsical clouds add character to beautiful sunny days, yet … Contrails formed from the exhaust of aircraft flying in the upper level of the troposphere can persist and spread into formations resembling cirrus which are designated cirrus homogenitus . The vigorous upward motions produce these pyrocumulus clouds that look similar to thunderstorm clouds, which also form due to strong upward moving air.  The height of the cloud (from its bottom to its top) depends on the temperature profile of the atmosphere and of the presence of any inversions. At this point a positive feedback ensues: since the RH is above 100%, water vapor condenses, releasing latent heat, warming the air and spurring further convection. In arid and mountainous areas, the cloud base can be in excess of 6,100 metres (20,000 ft). The word cumulus means a pile or heap. The latter genus-type is sometimes categorized separately as cumulonimbiform due to its more complex structure that often includes a cirriform or anvil top. , Cumulus humilis clouds usually indicate fair weather.  Significant growth of these patches indicates high-altitude instability and can signal the approach of poorer weather. Cumulus clouds start forming when solar energy causes liquid water on Earth to evaporate. A cloud forms when air is heated by the sun.  The ice crystals in the base of the altocumulus clouds and in the virga were found to be dendrites or conglomerations of dendrites while needles and plates resided more towards the top. Cumulus Clouds. Parts of the earth that have more water have more clouds because there is more water vapor. Although smaller droplets may have been present, the measurements were not sensitive enough to detect them. Cumulonimbus clouds are a type of cumulus cloud associated with thunder storms and heavy precipitation. They are less common in tropical areas and commonly form after cold fronts. Click on the image to view the large version. Due to the extremely small size of the evaporating water droplets, this process becomes largely meaningless after the larger droplets have grown to around 20 to 30 micrometres, and the second stage takes over. Cumulus clouds that do not get very tall are indicators of fair weather. For other uses, see, harvnb error: no target: CITEREFGarret,_et_al.2006 (, harvnb error: no target: CITEREFCarey_et_al.2008 (, "Cloud Classification and Characteristics", National Oceanic and Atmospheric Administration, "The identification of cloud types in LANDSAT MSS images", "L7 Clouds: Stratus fractus (StFra) and/or Cumulus fractus (CuFra) bad weather", "Will Clouds Speed or Slow Global Warming? , Cirrocumulus clouds form in patches and cannot cast shadows. We are temporarily tweeting exclusively on.  Cirrocumulus are, like other members of the cumuliform and stratocumuliform categories, formed via convective processes. In the middle level are the alto- clouds, which consist of the limited-convective stratocumuliform cloud altocumulus and the stratiform cloud altostratus.  Cumulus mediocris clouds are similar, except that they have some vertical development, which implies that they can grow into cumulus congestus or even cumulonimbus clouds, which can produce heavy rain, lightning, severe winds, hail, and even tornadoes. But, what are they, really? Their horizontal base and dome-shaped surface resemble a cauliflower. It’s very easy to predict when cumulus clouds are a sign of evolving storms by looking at whether the cloud is expanding or dissipating. Again, these are preferred regions for soaring, although the thermal updrafts are turbulent and irregular (not smooth and continuous like a mountain wave). When the air is warmer, it often appears that the gently rolling irregular patches of fluff are stacked one on the other.  In places, cumulus clouds can have "holes" where there are no water droplets. They commonly have anvil clouds. They are formed in the troposphere at a lower altitude of below 8,000 feet. Image credit: NASA/JPL-Caltech. , Cumulus clouds are a genus of free-convective low-level cloud along with the related limited-convective cloud stratocumulus. These are much more modest cumulus clouds, but cumulus clouds nonetheless. Stratus clouds are formed with an air mass is lifted vertically into the air, and reaches a temperature cool enough for condensation to begin. The skew was roughly neutral. The base of each cloud is often flat and may be only 1000 meters (3300 feet) above the ground. A cloud is made up of liquid water droplets. The cloud then dissipates into cirrus. Clouds are made of water drops. They form when turbulent vertical currents meet a cirrus layer, creating the puffy cumulus shape. The moisture in the clouds will come back to the earth as rain or some other type of precipitaion. This photo was taken by Mandy Khaiyer form Pennsylvania State University, an area of low mountains. This averages out to a net loss of 5 °C (9.0 °F). Cumulus clouds can be formed from water vapour, supercooled water droplets, or ice crystals, depending upon the ambient temperature. Since clouds are formed by raindrops cumulus clouds often are forerunners of rainstorms. , The species Cumulus fractus is ragged in appearance and can form in clear air as a precursor to cumulus humilis and larger cumulus species-types; or it can form in precipitation as the supplementary feature pannus (also called scud) which can also include stratus fractus of bad weather.  The ice crystals in the bottoms of cirrocumulus clouds tend to be in the form of hexagonal cylinders. Cumulonimbus clouds are the final form of growing cumulus clouds. Altocumulus clouds are a mid-level cloud that forms from 2,000 metres (6,600 ft) high to 4,000 metres (13,000 ft) in polar areas, 7,000 metres (23,000 ft) in temperate areas, and 7,600 metres (24,900 ft) in tropical areas.  On Mars, the Viking Orbiter detected cirrocumulus and stratocumulus clouds forming via convection primarily near the polar icecaps. Their name derives from the Latin cumulo-, meaning heap or pile. Stratus clouds are also low-level.  Cumulus clouds, on the other hand, have a variable effect on heating the earth's surface. Cumulus clouds are detached, individual, cauliflower-shaped clouds usually spotted in fair weather conditions. The tree main types of clouds are: Cumulus, Stratus and Cirrus clouds. Cumulus clouds are formed when sunshine warms moist air pockets, causing them to rise at a quickened pace. metaphor: bubbles rising in a pot of water). Water, like all matter, is made up of molecules. How do cumulus clouds form?All cumulus clouds develop because of convection. Cumulus clouds are formed when sunshine warms moist air pockets, causing them to rise at a quickened pace. In this phase, water vapor condenses on various nuclei present in the air, forming the cumulus cloud. The tops … They come in many distinct subforms and generally cool the earth by reflecting the incoming solar radiation. The most important thing to observe is how big the cumulus cloud is, and whether there are signs of active growth. Most often they drift alone and do not touch. The high-level cloud, cirrocumulus, is a stratocumuliform cloud of limited convection. The warm, moist air rises and cools, eventually condensing into a cumulus cloud. These water droplets form on tiny particles, like dust, that are floating in the air. Due to the low temperature in the homosphere, water freezes at its dew point, and droplets are formed. Stratocumulus clouds form more of a blanket over the sky.  The water droplets form when water vapor condenses on the nuclei, and they may then coalesce into larger and larger droplets. Cumulus congestus clouds have a cauliflower-like structure and tower high into the atmosphere, hence their alternate name "towering cumulus". , The height at which the cloud forms depends on the amount of moisture in the thermal that forms the cloud. On reaching this layer, they spread sideways. Cumulus clouds have sharp outlines and a flat base. This is not the norm however. Then there are the cloud streets — a formation resembling a long line of clouds, either continuous, or broken, which is formed as a result of cumulus clouds falling in line. Towering Cumulus Stage: The first stage is the towering cumulus stage, or growth stage. The fluffy, white cumulus clouds that commonly appear in the sky form when hot, moist air is …  There are also cumuliform clouds of limited convection that comprise stratocumulus (low-étage), altocumulus (middle-étage) and cirrocumulus (high-étage). High clouds form 3,000 to 7,600 metres (9,800 to 24,900 ft) in high latitudes, 5,000 to 12,000 metres (16,000 to 39,000 ft) in temperate latitudes, and 6,100 to 18,000 metres (20,000 to 59,100 ft) in low, tropical latitudes.  The Galileo space probe detected massive cumulonimbus clouds near the Great Red Spot on Jupiter. They are generally about one kilometer wide which is about the size of your fist or larger when you hold up your hand at arm's length to look at the cloud. Cumulus clouds are low-level clouds, generally less than 2,000 m (6,600 ft) in altitude unless they are the more vertical cumulus congestus form. Cumulus clouds are the large fluffy type of clouds, which almost look like cotton balls or piles of cotton candy up in the sky. There are many varieties of altocumulus, however, meaning they can appear in a range of shapes. They are not solid, but instead tend to have stepped funnels coming in from the ends. ... Cumulus clouds may appear by themselves, in lines, or in clusters. In 2008, the Cassini spacecraft determined that cumulus clouds near Saturn's south pole were part of a cyclone over 4,000 kilometres (2,500 mi) in diameter. Part I. What you may not have known is that there is a lot of science behind clouds, including cumulus clouds, and it is very interesting to learning more about what these clouds mean for the weather. Vertical clouds usually have the word "cumulus" in their name. If observed during a storm, these clouds may be referred to as thunderheads. The cirrus clouds are white, light and thin and seem to be scattered across the sky. Clouds also form when air is forced upward at areas of low pressure. The increased pressure results in those droplets evaporating and the resulting water vapor condensing on the larger droplets. Cumulus clouds are associated with convection. A typical cumulus cloud has a base height of 1000 meters. When several cumulonimbus clouds occur beside each other, forming a line, they become what is known as a “squall”. A pyrocumulus is a fire cloud.  The droplets were very small, ranging down to around 5 micrometres in diameter. They can produce precipitation. Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Cumulus clouds are a sign of fair weather, though they may discharge rains sometimes in form of a light shower. The Height of Clouds. These most commonly occur in the morning, when cool evening air meets sun-warmed air. Cumulus clouds may be formed by three things: supercooled water droplets, ice crystals, or water vapor. On reaching this layer, they spread sideways.  Cumulus velum clouds have an ice crystal veil over the growing top of the cloud. Other types of clouds, such as cumulus clouds, form above mountains too as air is warmed at the ground and rises. How are clouds formed on mountains? Cumulus clouds belong to the Clouds with Vertical Growth group. Altocumulus clouds are small mid-level layers or patches of clouds, called cloudlets, which most commonly exist in the shape of rounded clumps. The side of the mountains that the wind blows towards is called the windward side. Rain forms in a cumulus cloud via a process involving two non-discrete stages. Clouds look fluffy and light but the truth is the amount of water that makes up one cloud can weigh more then an airplane! Cumulus clouds are white, puffy clouds that look like pieces of floating cotton. Cumulus clouds are formed near the earth when hot wet air rises from the ground. above the Earth's surface. They are formed … Cumulonimbus (from Latin cumulus, "heaped" and nimbus, "rainstorm") is a dense, towering vertical cloud, forming from water vapor carried by powerful upward air currents. , Due to reflectivity, clouds cool the earth by around 12 °C (22 °F), an effect largely caused by stratocumulus clouds.  The variety Cumulus radiatus forms in radial bands called cloud streets and can comprise any of the four species of cumulus. This cooling takes place at a rate of 10°C per km. The Short Answer: Clouds are created when water vapor, an invisible gas, turns into liquid water droplets. I've also read websites saying when the water vapor reaches its saturation … Cumulus cloud formation. Sometimes, though, these Cumulus clouds can transform into larger, denser clouds that can produce rain and snow. 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[ 55 ], `` cumulus '' detected cirrocumulus and stratocumulus clouds form the most important thing to is! Cirrocumulus cloudlets are usually made up of both ice and 'supercooled ' water proportional to the pressure... Turbulent vertical currents meet a cirrus layer, while their horizontal extent is controlled by condensation! That have more clouds because there is a cumulus cloud is flat and the top of each cloud is and. The water vapor lowers its capacity to hold water vapor encounters a mountain side, it is divided into precipitation-bearing.