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For other uses, see Cloud (disambiguation).
Part of the Nature series
Weather
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Gnome-emblem-web.svgEnvironment
.A cloud is a visible mass of droplets, in other words, little drops of water or frozen crystals suspended in the atmosphere above the surface of the Earth or another planetary body.^ CLD Cloud- A visible aggregate of minute water droplets or ice particles in the atmosphere above the Earth's surface.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ CLD) A visible aggregate of minute water droplets or ice particles in the atmosphere above the Earth's surface.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Climate System The system consisting of the atmosphere (gases), hydrosphere (water), lithosphere (solid rocky part of the Earth), and biosphere (living) that determine the Earth's climate.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .A cloud is also a visible mass attracted by gravity, such as masses of material in space called interstellar clouds and nebulae.^ Such is the case with Cloud Computing and mass delivery of Internet Protocol applications and services.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 ^ Convection which occurs without cloud formation is called dry convection, while the visible convection processes referred to above are forms of moist convection.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 Clouds are studied in the nephology or cloud physics branch of meteorology. .It is composed for more than 20° of gas.^ Additionally the company operates one of the largest virtual contact centers with more than 20,000 independent agents in the cloud.
  • Cloud Computing Conference 2009 10 February 2010 13:33 UTC cloudslam09.com [Source type: FILTERED WITH BAYES]
.On Earth the condensing substance is typically water vapor, which forms small droplets or ice crystals, typically 0.01 mm (0.00039 in) in diameter.^ Cloud Condensation Nuclei Small particles in the air on which water vapor condenses and forms cloud droplets.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ CNTR Center CNTRL Central CNVG Converge CNVTV Convective Coalescence The process by which water droplets in a cloud collide and come together to form raindrops.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Condensation Funnel A funnel-shaped cloud associated with rotation and consisting of condensed water droplets (as opposed to smoke, dust, debris, etc.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .When surrounded by billions of other droplets or crystals they become visible as clouds.^ While some applications will always belong in their data center, they may have others (possibly hundreds) that could run more cost-effectively in the right cloud.
  • Enterprise Cloud Computing Blog 10 February 2010 13:33 UTC www.cloudswitch.com [Source type: FILTERED WITH BAYES]

 ^ Similar types of services are available from other large communications companies around the world but they do not seem to be captured as companies worthy of being on the Cloud Computing radar.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 ^ CLD Cloud- A visible aggregate of minute water droplets or ice particles in the atmosphere above the Earth's surface.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 Dense deep clouds exhibit a high reflectance (70% to 95%) throughout the visible range of wavelengths. They thus appear white, at least from the top. .Cloud droplets tend to scatter light efficiently, so that the intensity of the solar radiation decreases with depth into the gases, hence the gray or even sometimes dark appearance at the cloud base.^ Ceilometer A device using a laser or other light source to determine the height of a cloud base.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ An optical ceilometer uses triangulation to determine the height of a spot of light projected onto the base of the cloud; a laser ceilometer determines the height by measuring the time required for a pulse of light to be scattered back from the cloud base.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Crepuscular Rays The alternating bands of light and dark (rays and shadows) seen at the earth's surface when the sun shines through clouds.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .Thin clouds may appear to have acquired the color of their environment or background and clouds illuminated by non-white light, such as during sunrise or sunset, may appear colored accordingly.^ The color varies from blue inside to red outside and the phenomenon is attributed to diffraction of light by thin clouds or mist (distinguished from halo).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Both internal and cloud resources appear as if they’re running locally, using a common interface spanning multiple clouds and the local environment.
  • Enterprise Cloud Computing Blog 10 February 2010 13:33 UTC www.cloudswitch.com [Source type: FILTERED WITH BAYES]

 ^ In solar-terrestrial terms, a white or colored circle or set of concentric circles of light of small radius seen around a luminous body, especially around the sun or moon.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 Clouds look darker in the near-infrared because water absorbs solar radiation at those wavelengths.

Contents

Classification

A cumulus cloudscape over Swifts Creek, Victoria, Australia
.Cloud types are divided into two general categories: layered and convective.^ Convective Boundary Layer The unstable boundary layer that forms at the surface and grows upward through the day as the ground is heated by the sun and convective currents transfer heat upwards into the atmosphere.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .These names distinguish a cloud's altitude.^ These clouds are of high altitude (20,000-40,000 ft or 6000 -12,000 m).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .Clouds are classified by the base height, not the cloud top, and bases may differ depending on the geographical zone.^ Cloud Ceiling Same as Ceiling ; the height of the cloud base for the lowest broken or overcast cloud layer.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ It may occur as tower-like clouds with cauliflower tops.
  • weather.com - Glossary 10 February 2010 13:33 UTC www.weather.com [Source type: FILTERED WITH BAYES]

 ^ All of the different user groups should be able to see how a cloud-based application compares to a traditional one.
  • Enterprise Cloud Computing Blog 10 February 2010 13:33 UTC www.cloudswitch.com [Source type: FILTERED WITH BAYES]

 This system was proposed in 1802, when it was presented to the Askesian Society by Luke Howard.
A sky of cirrus clouds.

High clouds (Family A)

.High clouds will form between 10,000 and 25,000 ft (3,000 and 8,000 m) in the polar regions, 16,500 and 40,000 ft (5,000 and 12,000 m) in the temperate regions and 20,000 and 60,000 ft (6,000 and 18,000 m) in the tropical region.^ Reply Architect0001 Thursday, November 20 2008 Interesting correlation drawn between Utility and Cloud Computing.
  • How Cloud & Utility Computing Are Different – GigaOM 10 February 2010 13:33 UTC gigaom.com [Source type: General]

 ^ Sue F. -- November 15th, 2009 at 10:12 pm Does anyone know where Cloud is today?
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 ^ CI) High-level clouds (16,000 feet or higher), composed of ice crystals and appearing in the form of white, delicate filaments or white or mostly white patches or narrow bands.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 [1]

Middle clouds (Family B)

.Middle clouds tend to form at 6,500 ft (2,000 m) but may form at heights up to 13,000 ft (4,000 m), 23,000 ft (7,000 m) or 25,000 ft (8,000 m) depending on the region.^ I go to todd county MIddle school and i will graguate for 8th grade.I hope to talk to Miss kathren about going with her on her next trip to see cloud.If she may see this.
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 ^ These clouds are of high altitude (20,000-40,000 ft or 6000 -12,000 m).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 Nimbostratus clouds are sometimes included with the middle clouds.[1]

Low clouds (Family C)

Stratocumulus clouds, between Cumulus in the foreground and background
.These are found up to 6,500 ft (2,000 m)[1] and include the stratus (dense and grey).^ These vendors, which include my own company, GigaSpaces , are building software platforms made for the cloud from the ground up: “cloudware,” if you will.
  • How Cloud & Utility Computing Are Different – GigaOM 10 February 2010 13:33 UTC gigaom.com [Source type: General]

 ^ These clouds are of high altitude (20,000-40,000 ft or 6000 -12,000 m).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 When stratus clouds contact the ground, they are called fog.
Clouds in Family C include:

Vertical clouds (Family D)

A typical anvil shaped Cumulonimbus incus
.These clouds can have strong up-currents, rise far above their bases and form at many heights.^ What remains to be seen is whether the current bandwagon of cloud computing will solve some of the wider issues that sit behind these types of installation.
  • Cloud computing terminology - Computerworld Blogs 10 February 2010 13:33 UTC blogs.computerworld.com [Source type: General]

 ^ On the other hand many of those same companies are currently or projected to be capacity limited in their own data center based on space or power limitations.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 ^ CIG) - The height of the cloud base for the lowest broken or overcast cloud layer.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]
Clouds in Family D include:

Other clouds

.A few clouds can be found above the troposphere; these include noctilucent and polar stratospheric clouds (or nacreous clouds), which occur in the mesosphere and stratosphere respectively.^ These vendors, which include my own company, GigaSpaces , are building software platforms made for the cloud from the ground up: “cloudware,” if you will.
  • How Cloud & Utility Computing Are Different – GigaOM 10 February 2010 13:33 UTC gigaom.com [Source type: General]
Some clouds form as a consequence of interactions with specific geographical features. Perhaps the strangest geographically-specific cloud in the world is Morning Glory, a rolling cylindrical cloud which appears unpredictably over the Gulf of Carpentaria in Northern Australia. Associated with a powerful "ripple" in the atmosphere, the cloud may be "surfed" in glider aircraft.

Cloud fields

.A cloud field is simply a group of clouds but sometimes cloud fields can take on certain shapes that have their own characteristics and are specially classified.^ Comma Cloud A synoptic scale cloud pattern with a characteristic comma-like shape, often seen on satellite photographs associated with large and intense low-pressure systems.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 Stratocumulus clouds can often be found in the following forms:
  • Actinoform, which resembles a leaf or a spoked wheel.
  • Closed cell, which is cloudy in the center and clear on the edges, similar to a filled honeycomb.
  • Open cell, which resembles a honeycomb, with clouds around the edges and clear, open space in the middle.

Colors

Cloud iridescence occurring in clouds
Sunset reflecting shades of grey and pink in clouds.
.The color of a cloud, as seen from the Earth, tells much about what is going on inside the cloud.^ The color varies from blue inside to red outside and the phenomenon is attributed to diffraction of light by thin clouds or mist (distinguished from halo).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ I go to todd county MIddle school and i will graguate for 8th grade.I hope to talk to Miss kathren about going with her on her next trip to see cloud.If she may see this.
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 ^ You’ve written an interesting attempt to clarify a subject that’s confusing many people at the moment and I think that much of what you’ve written about cloud computing is quite interesting.
  • How Cloud & Utility Computing Are Different – GigaOM 10 February 2010 13:33 UTC gigaom.com [Source type: General]

 .Clouds form because warm air tends to absorb water vapor, which is lighter than air, thus helping the mixture to rise.^ Cloud Condensation Nuclei Small particles in the air on which water vapor condenses and forms cloud droplets.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ CNTR Center CNTRL Central CNVG Converge CNVTV Convective Coalescence The process by which water droplets in a cloud collide and come together to form raindrops.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Air parcels rising into this layer become cooler than the surrounding air, which inhibits their ability to rise further and produce thunderstorms.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .As it rises the air containing it cools and the vapor tends to condense out of the air as micro-droplets.^ Cloud Condensation Nuclei Small particles in the air on which water vapor condenses and forms cloud droplets.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .These tiny particles of water are densely packed and sunlight cannot penetrate far into the cloud before it is reflected out, giving a cloud its characteristic white color.^ Upper portions of these clouds may be composed of water and ice.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Taken to the next step, this implies that cloud computing infrastructures, and specifically their middleware and application platforms, should ideally have these characteristics: .
  • How Cloud & Utility Computing Are Different – GigaOM 10 February 2010 13:33 UTC gigaom.com [Source type: General]

 ^ A strong Catalina eddy may extend to 6000 feet and these clouds will move through the inland valleys and reach as far as Palmdale.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .As a cloud matures, the dense water droplets may combine to produce larger droplets, which may combine to form droplets large enough to fall as rain.^ Upper portions of these clouds may be composed of water and ice.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ CNTR Center CNTRL Central CNVG Converge CNVTV Convective Coalescence The process by which water droplets in a cloud collide and come together to form raindrops.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Condensation Funnel A funnel-shaped cloud associated with rotation and consisting of condensed water droplets (as opposed to smoke, dust, debris, etc.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .By this process of accumulation, the space between droplets becomes increasingly larger, permitting light to penetrate farther into the cloud.^ Now with the emerging availability of Private and Public Clouds and typically constrained premise space and power this capability could become even more interesting.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 .If the cloud is sufficiently large and the droplets within are spaced far enough apart, it may be that a percentage of the light which enters the cloud is not reflected back out before it is absorbed.^ A strong Catalina eddy may extend to 6000 feet and these clouds will move through the inland valleys and reach as far as Palmdale.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 A simple example of this is being able to see farther in heavy rain than in heavy fog. This process of reflection/absorption is what causes the range of cloud color from white to black. .For the same reason, the undersides of large clouds and heavy overcasts can appear as various degrees of grey shades, depending on how much light is being reflected or transmitted back to the observer.^ Similar types of services are available from other large communications companies around the world but they do not seem to be captured as companies worthy of being on the Cloud Computing radar.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]
Other colors occur naturally in clouds. Bluish-grey is the result of light scattering within the cloud. .In the visible spectrum, blue and green are at the short end of light's visible wavelengths, while red and yellow are at the long end.^ The color varies from blue inside to red outside and the phenomenon is attributed to diffraction of light by thin clouds or mist (distinguished from halo).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 The short rays are more easily scattered by water droplets, and the long rays are more likely to be absorbed. .The bluish color is evidence that such scattering is being produced by rain-sized droplets in the cloud.^ I tell you, that the Clouds, when full of rain, bump against one another, and that, being inordinately swollen out, they burst with a great noise.
  • The Internet Classics Archive | The Clouds by Aristophanes 12 September 2009 2:49 UTC classics.mit.edu [Source type: Original source]
A greenish tinge to a cloud is produced when sunlight is scattered by ice. A cumulonimbus cloud emitting green is an imminent sign of heavy rain, hail, strong winds and possible tornadoes.
.Yellowish clouds are rare but may occur in the late spring through early fall months during forest fire season.^ A strong Catalina eddy may extend to 6000 feet and these clouds will move through the inland valleys and reach as far as Palmdale.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Collar Cloud A generally circular ring of cloud that may be observed on rare occasions surrounding the upper part of a wall cloud.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 The yellow color is due to the presence of pollutants in the smoke.
Red, orange and pink clouds occur almost entirely at sunrise/sunset and are the result of the scattering of sunlight by the atmosphere. .The clouds do not become that color; they are reflecting long and unscattered rays of sunlight, which are predominant at those hours.^ Kaycee -- November 8th, 2009 at 9:42 am They’re not supposed to destroy CLoud I thought because of his color but even so DOWN WITH THE BLM!!!
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 The effect is much like if one were to shine a red spotlight on a white sheet. In combination with large, mature thunderheads this can produce blood-red clouds.

Clouds and climate

.
Global cloud cover, averaged over the month of October, 2009. The outlines of the continents can often be traced through observations of clouds alone, with the sharpest outlines where very dry land is surrounded by ocean.^ Susan Waidman -- October 26th, 2009 at 12:29 am Ginger Kathrens inspired our family to make the trek up the Pryors to meet Cloud.
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 ^ October 26th, 2009 at 12:15 am I too, am outraged that the horses would be violently rounded up and robbed of their freedom to live peacefully on public lands.
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 ^ October 13th, 2009 at 12:03 am Watch the new show Cloud: Challenge of the Stallions on PBS stations nationwide, Sunday, Oct.
  • Cloud: Wild Stallion of the Rockies - Introduction - Wild Horses | Nature 10 February 2010 13:33 UTC www.pbs.org [Source type: General]

 NASA composite satellite image; larger image available here.
See also: Cloud cover and Cloud feedback
.Understanding the role of clouds in regulating both weather and climate is at an early stage, and remains a critical unknown factor in predicting the extent of global warming.^ Climate Prediction Center This Center is one of several centers under the National Centers for Environmental Prediction (NCEP) part of the National Weather Service (NWS) in the National Oceanic and Atmospheric Administration (NOAA).
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Healthcare has become a center stage concern along with other socially-politically charged issues such as global warming and going green.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 ^ Climate Past Weather Predictions .
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 [citation needed]

Global brightening

New research indicates a global brightening trend.[5]
Global brightening is caused by decreased amounts of particulate matter in the atmosphere, leaving less surface area for condensation to occur. .Less condensation in the atmosphere and more evaporation from increasing amounts of sunlight striking the surfaces of water causes more moisture to build in the air, creating fewer but more dense clouds.^ Capillary Waves Waves caused by the initial wind stress on the water surface causes what are known as capillary waves.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Conditionally Unstable Air An atmospheric condition that exists when the environmental lapse rate is less than the dry adiabatic lapse rate but greater than the moist adiabatic lapse rate.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ With the cap in place, air below it can continue to warm and/or moisten, thus increasing the amount of potential instability.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

Bacteria in clouds

Bacteria that live in clouds may have evolved the ability to promote rainstorms as a way to disperse themselves. .These microbes—called ice nucleators—are found in rain, snow, and hail throughout the world, according to Brent Christner, a microbiologist at Louisiana State University.^ In the state of Louisiana, where the LSU Tigers hail, there is a ginormous data center set in the city of Baton Rouge.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 .These bacteria may be part of a constant feedback between terrestrial ecosystems and clouds.^ Search Engine Optimization is playing a huge part in these millions of businesses worldwide getting access to Cloud based hosted solutions.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 ^ Collar Cloud A generally circular ring of cloud that may be observed on rare occasions surrounding the upper part of a wall cloud.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Upper portions of these clouds may be composed of water and ice.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 They may rely on the rainfall to spread to new habitats, much as plants rely on windblown pollen grains, Christner said. [6]

Other planets

Main article: Extraterrestrial atmospheres
.Within our Solar System, any planet or moon with an atmosphere also has clouds.^ And with our recent upgrades to the product there is no reason why every Cloud based service provider on the planet shouldn't be using it.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 Venus's clouds are composed of sulfuric acid droplets. .Mars has high, thin clouds of water ice.^ Upper portions of these clouds may be composed of water and ice.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Strong upward currents in vertically developed clouds can carry high concentrations of supercooled water to high levels where temperatures are quite cold.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Cirriform High altitude ice clouds with a very thin wispy appearance.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 .Both Jupiter and Saturn have an outer cloud deck composed of ammonia clouds, an intermediate deck of ammonium hydrosulfide clouds and an inner deck of water clouds.^ Upper portions of these clouds may be composed of water and ice.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 Uranus and Neptune have cloudy atmospheres dominated by methane gas.
Saturn's moon Titan has clouds believed to be composed largely of droplets of liquid methane. The Cassini–Huygens Saturn mission uncovered evidence of a fluid cycle on Titan, including lakes near the poles and fluvial channels on the surface of the moon.

Gallery

.In mountainous areas one often finds the peaks above the clouds as seen here with the Piz Bernina in the Swiss Alps.^ Clear Slot With respect to severe thunderstorms, a local region of clearing skies or reduced cloud cover, indicating an intrusion of drier air; often seen as a bright area with higher cloud bases on the west or southwest side of a wall cloud.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Cap Cloud A stationary cloud directly above an isolated mountain peak, with cloud base below the elevation of the peak.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Comma Cloud A synoptic scale cloud pattern with a characteristic comma-like shape, often seen on satellite photographs associated with large and intense low-pressure systems.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]
Clouds and cloud bow above the Pacific Ocean.
Rain clouds over the North Sea taken from the coast of Herne Bay, Kent.

See also

Weather portal

References

  1. ^ a b c Cloud Classifications
  2. ^ "Plymouth State Meteorology Program Cloud Boutique". http://vortex.plymouth.edu/clouds.html/. 
  3. ^ "Cloud Types: common cloud classifications". WW2010. University of Illinois. http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/home.rxml. 
  4. ^ "cloud: Classification of Clouds". Infoplease.com. http://www.infoplease.com/ce6/weather/A0857400.html. 
  5. ^ From Dimming to Brightening: Decadal Changes in Solar Radiation at Earth's Surface by Martin Wild et al. (Science 6 May 2005; 308: 847–850)
  6. ^ Rainmaking Bacteria Ride Clouds to "Colonize" Earth?

Bibliography

  • Hamblyn, Richard The Invention of Clouds – How an Amateur Meteorologist Forged the Language of the Skies Picador; Reprint edition (August 3, 2002). ISBN 0312420013
  • http://www.ldeo.columbia.edu/news/2006/04_14_06.htm Could Reducing Global Dimming Mean a Hotter, Dryer World?

External links

Meteorological data and variables
General
Condensation
Convection
Temperature
Pressure
Cloud types
Extreme-level
High-level
Medium-level
Low-level
Vertical
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Source material

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The Cloud
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The Cloud may refer to:

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Up to date as of January 23, 2010

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.The Hebrew so rendered means "a covering," because clouds cover the sky.^ Convective Overdevelopment Convection that covers the sky with clouds, thereby cutting off the sunshine that produces convection.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ Cloudy When 7/8ths or more of the sky is covered by clouds.
  • Glossary - NOAA's National Weather Service 10 February 2010 13:33 UTC www.nws.noaa.gov [Source type: FILTERED WITH BAYES]

 ^ I mean that the view as you see a cloud in the sky.
  • How Cloud & Utility Computing Are Different – GigaOM 10 February 2010 13:33 UTC gigaom.com [Source type: General]

 The word is used as a symbol of the Divine presence, as indicating the splendour of that glory which it conceals (Ex 16:10; 33:9; Num 11:25; 12:5; Job 22:14; Ps 1811). .A "cloud without rain" is a proverbial saying, denoting a man who does not keep his promise (Prov 16:15; Isa 18:4; 25:5; Jude 1:12).^ If all your email and voice calls go through the cloud, who is responsible for what it says?
  • The Technium: Cloud Culture 10 February 2010 13:33 UTC www.kk.org [Source type: General]

 ^ It goes without saying that in reaching out to them one of my intentions was to get them on our cloud.
  • Cloud | The Official Rackspace Blog 10 February 2010 13:33 UTC www.rackspace.com [Source type: General]

 ^ We in the IT industry are influenced by the "Technorati" who hone in on what the "big names" in the industry say about Cloud and who is offering what service.
  • The Citrix Blog » Citrix Community 10 February 2010 13:33 UTC community.citrix.com [Source type: General]

 .A cloud is the figure of that which is transitory (Job 30:15; Hos 6:4).^ The mixing cloud is another application of the Clausius- Clapeyron equation (figure 30).

 A bright cloud is the symbolical seat of the Divine presence (Ex 29:42, 43; 1 Kg 8:10; 2Chr 5:14; Ezek 43:4), and was called the Shechinah (q.v.). .Jehovah came down upon Sinai in a cloud (Ex 19:9); and the cloud filled the court around the tabernacle in the wilderness so that Moses could not enter it (Ex 40:34, 35).^ Small war parties came down from time to time upon stray travelers, who received no mercy at their hands, or made dashes upon neighboring forts.

 ^ Due to the fluidic nature of the Cloud Computing architecture, your data could move around.

 At the dedication of the temple also the cloud "filled the house of the Lord" (1 Kg 8:10). .Thus in like manner when Christ comes the second time he is described as coming "in the clouds" (Mt 17:5; 24:30; Acts 1:9, 11).^ In his session , "Infrastructure and Middleware on Demand," he intends to describe and explain how what's needed is on-demand middleware, automatic deployment, and run-time management of custom applications in the clouds.
  • 4th International Cloud Computing Conference & Expo Starts Today | Open Source Magazine 10 February 2010 13:33 UTC opensource.sys-con.com [Source type: General]
  • 4th International Cloud Computing Conference & Expo Starts Today | Open Web 10 February 2010 13:33 UTC openwebdeveloper.sys-con.com [Source type: General]

 ^ Like the Internet, cloud computing did not come out of blue.
  • Cloud Computing Conference 2009 10 February 2010 13:33 UTC cloudslam09.com [Source type: FILTERED WITH BAYES]

 ^ Like this by Commander_Spock October 3, 2008 7:53 AM PDT Re: "Technology Rules The World; and, the "Innovative Leadership" that is needed at this time will not be coming from the Redmond Campus".
  • Ballmer offers more on 'Windows Cloud' | Beyond Binary - CNET News 10 February 2010 13:33 UTC news.cnet.com [Source type: General]

 False teachers are likened unto clouds carried about with a tempest (2 Pet 2:17). .The infirmities of old age, which come one after another, are compared by Solomon to "clouds returning after the rain" (Eccl 12:2).^ Generally when it comes to migrating heavy data from one SQL server to another, among others following approaches are widely used: .

 ^ All of the different user groups should be able to see how a cloud-based application compares to a traditional one.
  • Enterprise Cloud Computing Blog 10 February 2010 13:33 UTC www.cloudswitch.com [Source type: FILTERED WITH BAYES]

 ^ This is just one of several initiatives and announcements we will be making in the coming weeks as we move to organize the Cloud Computing Interoperability Forum (CCIF) and Cloud Camp into a formalized organization.
  • Developer Platform Product Management - Development Unfiltered: From code, to cloud to comedy. : Moving Toward an Open Process on Cloud Computing Interoperability 10 February 2010 13:33 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

 .The blotting out of sins is like the sudden disappearance of threatening clouds from the sky (Isa 44:22).^ Like the Internet, cloud computing did not come out of blue.
  • Cloud Computing Conference 2009 10 February 2010 13:33 UTC cloudslam09.com [Source type: FILTERED WITH BAYES]

 ^ SOCRATES Have you not sometimes seen clouds in the sky like a centaur, a leopard, a wolf or a bull?
  • The Internet Classics Archive | The Clouds by Aristophanes 12 September 2009 2:49 UTC classics.mit.edu [Source type: Original source]
.Cloud, the pillar of, was the glory-cloud which indicated God's presence leading the ransomed people through the wilderness (Ex 13:22; 33:9, 10).^ Trajman is also a leading authority on cloud-based databases through his pioneering work launching Vertica's cloud database on Amazon EC2.
  • Cloud Computing Conference Track at Interop New York 2010 10 February 2010 13:33 UTC www.interop.com [Source type: FILTERED WITH BAYES]

 This pillar preceded the people as they marched, resting on the ark (Ex 13:21; 40:36). By night it became a pillar of fire (Num 9:17-23).
This entry includes text from Easton's Bible Dictionary, 1897.
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Simple English

[[File:|thumb|right|200px|Clouds in the sky]] A cloud is water in the atmosphere (air) that we can see. It is where rain and snow comes from.

Water on the earth evaporates (turns into gas) and goes up into the sky. There, when it is colder, the water condenses: it changes from a gas to drops of water or crystals of ice. We see these drops of water as clouds. The drops fall back down to earth as rain, and then the water evaporates again. This is called the "water cycle".

Clouds on other planets are sometimes just collections of gases.

Contents

How clouds form

The atmosphere always has a little bit of water vapor that humans can not see. Clouds form when the atmosphere can no longer hold all the invisible air vapor.[1] Any more water vapor condenses into very small water drops.[1]

Warm air holds more of water vapor than cool air.[1] So if warm air with lots of water inside cools, it can form a cloud. These are ways air can cool enough to form clouds:

  • when it is cooled by the ground at night, making a fog
  • along warm and cold fronts (where the weather is very hot or cold),
  • where air goes up the side of a mountain and cools as it goes higher
  • when warm air goes over a colder thing (such as cool water in a lake).

Clouds are heavy. The water in a cloud can have a mass of several million tons. Every cubic metre (m3) of the cloud has only about 5 grams of water in it. Cloud droplets are also about 1000 times heavier than evaporated water, so they are much heavier than air. They do not fall, but stay in the air, because there is warm air all round the heavier water droplets. When water changes from gas to droplets, this makes heat. Because the droplets are very small, they "stick" to the warm air.

Sometimes, clouds appear to be brilliant colors at sunrise or sunset. This has shown to be due to pollution in the air.

Cloud classification

]] Clouds are classified according to how high the base of the cloud is in the sky.[1] This system was suggested in 1802.

High-Level clouds

High clouds will form from 10,000 and 25,000 ft (3,000 and 8,000 m) in cold places, 16,500 and 40,000 ft (5,000 and 12,000 m) in the temperate regions and 20,000 and 60,000 ft (6,000 and 18,000 m) in the very hot tropics.[2]

  • Cirrocumulus (Cc)
  • Cirrus (Ci)
  • Cirrostratus (Cs)

Medium-level clouds

Middle clouds usually form at 6,500 ft (2,000 m). However, they may form as high as 13,000 ft (4,000 m), 23,000 ft (7,000 m) or 25,000 ft (8,000 m). It depends on where they are. Nimbostratus clouds are sometimes included with the middle clouds.[2]

  • Altostratus (As)
  • Altocumulus (Ac)

Low-level clouds

They are sometimes on ground level.[1] They can also be discovered up to 6,500 ft (2,000 m)[2] high. They include the strato clouds.[1] Cumulo clouds are also low-level and are made up of water drops.[1] When they push up through higher levels they also have ice crystals. These are found up to and include the stratus (dense and grey). When stratus clouds contact the ground, they are called fog.

Low-level clouds include:[3]

  • Cumulus (Cu)
    • Cumulus humilis
    • Cumulus mediocris
  • Stratocumulus (Sc)
  • Nimbostratus (Ns)
  • Stratus (St)

Types of clouds

There are different sorts of cloud, because of how fast the air goes up and if the air stands still or is moving. Also, some clouds make more rain, or make thunder and lightning. These differences come from how big the water droplets are, and how they join together.

There are three basic types of clouds:[1]

  • Stratus clouds are low, flat gray clouds. Most stratus clouds are near the sea. They are sometimes called "high fogs". Light rain often falls from stratus clouds. When precipitation falls from stratus clouds they are usually called nimbostratus.
  • Cumulus clouds are white puffy clouds. They are usually seen on bright days. They have flat bottoms, but the shape of the top is often different. When a cumulus cloud grows into a thunderstorm, it is called a cumulonimbus cloud.
  • Cirrus clouds are high, thin clouds. They are made up of ice crystals intead of water drops. Thin cirrus clouds are sometimes called mares' tails because they look like the tails of a horse.

Gallery

Clouds from

Clouds and cloud bow above the Pacific Ocean.

As a sign

In the Bible, clouds are often a sign of God's presence.

References

Other websites

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bjn:Rakun (météorologi)krc:Булутfrr:Swarken

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Citable sentences

Up to date as of December 20, 2010

Here are sentences from other pages on Cloud, which are similar to those in the above article.








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