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Study of the physical processes in atmospheric clouds
Cloud physics is the study of the physical processes that lead to the formation, evolution and impacts of atmospheric clouds, including precipitation and
Cloud_physics
Visible mass of particles suspended in the atmosphere
is undertaken in the cloud physics branch of meteorology. The World Meteorological Organization uses two methods of naming clouds in their respective layers
Cloud
Weather phenomenon involving electrostatic discharge
Intra-cloud (IC) or in-cloud – Within a single thundercloud Cloud-to-cloud (CC) or inter-cloud – Between two clouds Cloud-to-ground (CG) – Between a cloud and
Lightning
Short-term state of the atmosphere
May 2023. Retrieved 14 May 2023. Rogers, R. (1989). A Short Course in Cloud Physics. Oxford: Butterworth-Heinemann. pp. 61–62. ISBN 978-0-7506-3215-7. "Mean
Weather
Merging of droplets, bubbles or particles
coalescence has been studied with the aid of high-speed photography. In cloud physics the main mechanism of collision is the different terminal velocity between
Coalescence_(physics)
Particle detector for visualizing ionizing radiation
in Physics in 1936), used cloud chambers. The discovery of the kaon by George Rochester and Clifford Charles Butler in 1947 was made using a cloud chamber
Cloud_chamber
Low-altitude horizontal cloud formation
An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus. Roll clouds and shelf clouds are the two
Arcus_cloud
Fraction of the sky obscured by clouds when observed from a particular location
Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds on average when observed from a
Cloud_cover
Precipitation in the form of ice crystal flakes
cold. Snow develops in clouds that themselves are part of a larger weather system. The physics of snow crystal development in clouds results from a complex
Snow
Form of solid precipitation
0.CO;2. JSTOR 26182470. Rogers and Yau (1989). A Short Course in Cloud Physics. Massachusetts: Butterworth-Heinemann. ISBN 0-7506-3215-1. Jim Mezzanotte
Hail
Genus of dense, towering vertical clouds
Cumulonimbus (from Latin cumulus 'swell' and nimbus 'cloud') is a dense, towering, vertical cloud, typically forming from water vapor condensing in the
Cumulonimbus_cloud
Sub-field of physics dealing with the atmosphere's structure, composition, and motion
propagation models, cloud physics, statistical mechanics and spatial statistics which are highly mathematical and related to physics. It has close links
Atmospheric_physics
Act of intentionally altering or manipulating the weather
Lei, Henchi; Xiao, Hui; Hong, Yanchao (February 2015). "Advances in Cloud Physics and Weather Modification in China". Advances in Atmospheric Sciences
Weather_modification
Main climate class
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Temperate_climate
Type of intense dust storm
the desert, forming a wall of airborne sediment that precedes the storm cloud. This wall of dust can be up to 100 km (62 mi) wide, and several kilometers
Haboob
One of Earth's four temperate seasons
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Autumn
Return of a perturbed system into equilibrium
content grow within the cloud and will thus consume the contained moisture. The dynamics of relaxation are very important in cloud physics for accurate mathematical
Relaxation_(physics)
Weather modification that condenses clouds to cause rainfall
provided cloud physics, physical chemistry, and other field support. The High Plains Cooperative Pilot Project (HIPLEX) focused on convective cloud seeding
Cloud_seeding
Meteorological phenomenon
Retrieved 2009-03-17. Raymond A. Serway; John W. Jewett (1 January 2018). Physics for Scientists and Engineers. Cengage Learning. pp. 533–. ISBN 978-1-337-67171-2
Wind_direction
Condensed water vapor that falls from clouds
6220B. doi:10.1029/2011jd016603. ISSN 0148-0227. Paul Sirvatka (2003). "Cloud Physics: Collision/Coalescence; The Bergeron Process". College of DuPage. Retrieved
Precipitation
Climatic effect causing a planet's atmosphere to trap heat and prevent cooling
understanding of the dynamics, thermodynamics, radiative transfer and cloud physics of hot and steamy atmospheres is weak," and that we "cannot therefore
Runaway_greenhouse_effect
Thunderstorm where little to no precipitation reaches the ground
arid areas. The shaft of precipitation that can be seen falling from a cloud without reaching the ground is called "virga". A thunderstorm does not have
Dry_thunderstorm
Study of the atmosphere, its processes, and its interactions with other systems
cloud physics, statistical mechanics and spatial statistics, each of which incorporate high levels of mathematics and physics. Atmospheric physics has
Atmospheric_science
Precipitation that forms when supercooled droplets of water freeze on a falling snowflake
However, both hail and graupel are common in thunderstorms with cumulonimbus clouds, though graupel also falls in winter storms, and at higher elevations as
Graupel
Storm characterized by lightning
the Netherlands, 1973 M. K. Yau and R. R. Rogers, Short Course in Cloud Physics, Third Edition, published by Butterworth-Heinemann, 1 January 1989,
Thunderstorm
Form of precipitation
9 December 2012. Retrieved 15 January 2010. Paul Sirvatka (2003). "Cloud Physics: Collision/Coalescence; The Bergeron Process". College of DuPage. Archived
Rain
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
List of severe weather phenomena
List_of_severe_weather_phenomena
British manufacturing chemist (1772–1864)
that "cloud formation and destruction were visible signs of atmospheric processes and were based on the laws of physics". Howard referred to cloud formation
Luke_Howard_(meteorologist)
West African dry weather season
conditions: it lowers the humidity, dissipates cloud cover, prevents rainfall formation and sometimes creates big clouds of dust which can result in dust storms
Harmattan
One of the Earth's four temperate seasons
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Spring_(season)
Weather of freezing precipitation and extreme winds
rises up into the atmosphere, creating low pressure near the ground and clouds up in the air. The air can also be pushed upwards by hills or large mountains
Winter_storm
Hottest of the four temperate seasons
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Summer
Streak or shaft of precipitation that evaporates or sublimates before reaching the ground
mechanism in which ice crystals from upper mixed-phase clouds fall into lower-lying liquid clouds and then grow larger by riming or vapour deposition through
Virga
Ground-level cloud of ice crystals
Diamond dust is a ground-level cloud composed of tiny ice crystals. This meteorological phenomenon is also referred to simply as ice crystals and is reported
Diamond_dust
Light liquid precipitation
in diameter. Drizzle is normally produced by low stratiform clouds and stratocumulus clouds. Precipitation rates from drizzle are on the order of a millimetre
Drizzle
Change of state of matter from a gas phase into a liquid phase
or insulated glazing. Air well (condenser) Bose–Einstein condensate Cloud physics Condenser (heat transfer) DNA condensation Dropwise condensation Groasis
Condensation
Precipitation consisting of small, translucent balls of ice
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Ice_pellets
Japanese orbiter mission to Venus (2010–2024)
studied the stratification of the atmosphere, atmospheric dynamics, and cloud physics. Astronomers working on the mission reported detecting a possible gravity
Akatsuki_(spacecraft)
American academic
Berkeley in 1969 and a Ph.D. in physics at Cornell University in 1975 under Carl Sagan. His research interests are in cloud physics, atmospheric chemistry, and
Owen_Toon
Disturbed state of an astronomical body's atmosphere
of opposing forces can create winds and result in the formation of storm clouds such as cumulonimbus. Small localized areas of low pressure can form from
Storm
Fast-flowing atmospheric air current
heat in the atmosphere. That vapor also condenses as droplets we know as clouds, which themselves trap more heat. The vapor is a big part of the amplification
Jet_stream
NLCs Night Shining Clouds
Noctilucent clouds (NLCs), or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere. When viewed from space, they are called
Noctilucent_cloud
Type of interstellar cloud
A molecular cloud—sometimes called a stellar nursery if star formation is occurring within—is a type of interstellar cloud of which the density and size
Molecular_cloud
Mediterranean wind
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Sirocco
Yearly period of low rainfall, especially in the tropics
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Dry_season
Process of ice crystal growth in clouds
total mass). For other processes affecting particle size, see rain and cloud physics. The principle of ice growth through vapor deposition on ice crystals
Wegener–Bergeron–Findeisen process
Wegener–Bergeron–Findeisen_process
Unit of measure used in weather radar
Retrieved May 18, 2026. M. K. Yau and R. R. Rogers (1989). Short Course in Cloud Physics, Third Edition. Butterworth-Heinemann. p. 190. ISBN 0750632151. "RIDGE
DBZ_(meteorology)
Coldest of the four temperate seasons
January 2010. Kenneth G. Libbrecht (2001). "Morphogenesis on Ice: The Physics of Snow Crystals" (PDF). Engineering & Science (1): 12. Archived from the
Winter
Type of tornado not originating from a mesocyclone
occurring with a parent cloud in its growth stage and with its vorticity originating in the boundary layer. The parent cloud does not contain a preexisting
Landspout
Climate classification
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Polar_climate
American businesswoman
Analytics Startup CloudPhysics Raises $2.5 Million From Mayfield Partners, VMware Co-Founders". TechCrunch. "Transitioning Google Cloud after three great
Diane_Greene
Interstellar cloud in the Milky Way Galaxy
the heliosphere, nearby interstellar clouds, and physical processes in the inter–cloud medium". Journal of Physics: Conference Series. 1620 (1) 012010
Local_Interstellar_Cloud
American information technology company
2020. Burke, Steven (February 23, 2021). "HPE Acquires Cloud Assessment 'Crown Jewel' CloudPhysics". CRN. Retrieved February 24, 2021. "Hewlett Packard
Hewlett_Packard_Enterprise
Weather phenomenon viewed from distance
shaft is mostly found underneath convective clouds, such as cumulonimbus cloud or cumulus congestus cloud during a downpour storm, as these have well
Precipitation_shaft
Weather event characterized by freezing rain
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Ice_storm
Thunderstorm during which there is snowfall
different from any other type of thunderstorm, but the top of the cumulonimbus cloud is usually quite low. In addition to snow, graupel or hail may fall as well
Thundersnow
Atmospheric phenomenon
air near the Earth's surface. Fog can be considered a type of low-lying cloud usually resembling stratus and is heavily influenced by nearby bodies of
Fog
Atmospheric scientist
research on cloud physics which informs global climate models and defines the processes leading to the formation of lightning from clouds. She is the
Marcia_Baker
Strong surface-level winds that radiate from a single point
sometimes downbursts emanate from cumulonimbus or even cumulus congestus clouds that are not producing lightning). Downbursts are most often created by
Downburst
South African atmospheric scientist
is a professor at Colorado State University. Her research considers cloud physics and mesoscale modelling. She is a fellow of the American Meteorological
Susan_van_den_Heever
Form of precipitation consisting of rain and melting snow
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Rain_and_snow_mixed
Short and very intense rain
millimetres (2.0 in) per hour for longer rainfalls. The associated convective cloud can extend up to a height of 15 kilometres (9.3 mi) above the ground. During
Cloudburst
Vortex or tornado occurring over a body of water
of water, usually appearing as a funnel-shaped cloud in contact with the water and a cumuliform cloud. There are two types of waterspout, each formed
Waterspout
Division of the year
2011-05-13. Khavrus, V.; Shelevytsky, I. (2012). "Geometry and the physics of seasons". Physics Education. 47 (6): 680–692. doi:10.1088/0031-9120/47/6/680. S2CID 121230141
Season
Australian geophysicist (1930–2022)
North Sydney Boys High School and Sydney University. He then joined the Cloud Physics Group, CSIRO Division of Radiophysics as a Research Officer. He was
Stewart_Turner
Violently rotating column of air
cumulus cloud. Tornadoes are often (but not always) visible in the form of a condensation funnel originating from the cloud base, with a cloud of rotating
Tornado
Seasonal changes in atmospheric circulation and precipitation
Michael Pidwirny (2008). CHAPTER 8: Introduction to the Hydrosphere (e). Cloud Formation Processes. Archived 2008-12-20 at the Wayback Machine Physical
Monsoon
American physicist
Gillespie algorithm. Gillespie's broader research has produced articles on cloud physics, random variable theory, Brownian motion, Markov process theory, electrical
Daniel_Gillespie
Strong wind
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Gale
Type of cloud
Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds formed by
Stratus_cloud
American linguist (born 2001)
Conservation. His mother studied air pollution, while his father was a cloud physics expert. His parents immigrated to the United States from Serbia in the
Adam_Aleksic
Surname list
player Hilding Köhler (1888–1982), professor of Meteorology, studied cloud physics Hugo W. Koehler (1886–1941), American naval officer during the Russian
Köhler
Academic journal
Meteorological Society. Applied research related to the physical meteorology, cloud physics, hydrology, weather modification, satellite meteorology, boundary layer
Journal of Applied Meteorology and Climatology
Journal_of_Applied_Meteorology_and_Climatology
Irish atmospheric physicist (1927–2012)
1927–2012) was an Irish professor of atmospheric physics who made contributions to remote sensing, cloud physics and inversion mathematics. The Twomey effect
Sean_A._Twomey
Feedback between climate change and the effect of clouds on radiation
A cloud feedback is a climate change feedback where some aspects of cloud characteristics (e.g. cloud cover, composition or height) are altered due to
Cloud_feedback
Type of whirlwind
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Dust_devil
Type of storm
anticyclonic vortex. These cloud systems on Neptune are known as 'companion clouds' because they are formed similarly to the cloud structures on Earth that
Anticyclonic_storm
Thunderstorm that is characterized by the presence of a mesocyclone
circulates into the warm, moisture laden inflow, the cloud base will frequently form a wall, and the cloud base often experiences a lowering, which, in extreme
Supercell
Lightning produced by a volcanic eruption
volcanic lightning can also occur when there are no ice crystals in the ash cloud. The earliest recorded observations of volcanic lightning are from Pliny
Volcanic_lightning
"greenhouse effect" in paragraph 2) cloud forest (cloud formation: see) nephology cloud physics cloud seeding cloud street cloud suck cloudburst (see "destruction"
Index_of_meteorology_articles
Meteorological research project
reports were prepared. These papers have included radar meteorology, cloud physics, hydrology/hydrometeorology, computer science, instrumentation, synoptic
Alberta_Hail_Project
American scientist
atmospheric physics, especially relating to global climate change and long-range transport of aerosol material. He is Emeritus Professor of Physics and Atmospheric
Glenn_Edmond_Shaw
Whirlwind induced by and often composed of fire
cumuliform cloud above. Fire whirls are not usually classifiable as tornadoes as the vortex in most cases does not extend from the surface to cloud base. Also
Fire_whirl
Area of astronomical research
of atmospheric processes such as the greenhouse effect, aerosol and cloud physics, and atmospheric chemistry and dynamics. In September 2022, astronomers
Extraterrestrial_atmosphere
Yearly period of high rainfall
the AMMA 2006 wet season experiment" (PDF). Atmospheric Chemistry and Physics Discussions: 17342. Archived from the original (PDF) on Feb 27, 2009. Retrieved
Wet_season
Genus of clouds, low-level cloud
Cumulus clouds are clouds that have flat bases and are often described as puffy, cotton-like, or fluffy in appearance. Their name derives from the Latin
Cumulus_cloud
Large scale rotating air mass
associated with broad areas of high-level clouds. Downward development results in an increase of cumulus clouds and the appearance of a surface vortex.
Cyclone
speech identified two main issues in classical physics that represented "two clouds" for the physics of 20th century: the lack of evidence for the existence
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
in Physics (Swedish: Nobelpriset i fysik) is awarded annually by the Royal Swedish Academy of Sciences to scientists in the various fields of physics. It
List of Nobel laureates in Physics
List_of_Nobel_laureates_in_Physics
British meteorologist and physicist (1869–1959)
physicist who shared the 1927 Nobel Prize in Physics with Arthur Compton for his invention of the cloud chamber. Charles Thomson Rees Wilson was born
C._T._R._Wilson
Region of rotation within a powerful thunderstorm
too large to be recognized when viewed from the ground, or may not carry clouds distinct enough from the surrounding calmer air to make the circulating
Mesocyclone
Sudden increase in atmospheric temperature
recognizing the events that precede them. Rain from a high convection cloud falls below cloud level and evaporates, cooling the air. Air parcels that are cooler
Heat_burst
Relation between vapour pressure and temperature
of Physics. 82 (4): 301–305. Bibcode:2014AmJPh..82..301K. doi:10.1119/1.4858403. Yau, M. K.; Rogers, R. R. (1989). Short Course in Cloud Physics (3rd ed
Clausius–Clapeyron_relation
Vertical rate of change of temperature in atmosphere
air-dispersion.com R. R. Rogers and M. K. Yau (1989). Short Course in Cloud Physics (3rd ed.). Butterworth-Heinemann. ISBN 978-0-7506-3215-7. Definition
Lapse_rate
Meteorological phenomenon
they react with other high altitude winds, causing a funnel to spin. A cloud forms over the funnel, making it visible. Minor whirlwind A minor whirlwind
Whirlwind
Light snowfall with little accumulation
Slush Topics Air pollution Atmosphere Chemistry Convection Physics River Climate Cloud Physics Fog Mist Season Cold wave Heat wave Jet stream Meteorology
Snow_flurry
Scottish meteorologist, physicist and marine engineer (1839–1919)
meteorologist, physicist and marine engineer. He was one of the founders of cloud physics and aerosol science, who built the first apparatus to measure the number
John_Aitken_(meteorologist)
One of five prizes established in 1895 by Alfred Nobel
medal. The reverse of the physics and chemistry medals depicts the Goddess of Nature in the form of Isis as she emerges from clouds holding a cornucopia.
Nobel_Prize_in_Physics
Interdisciplinary scientific study of the atmosphere focusing on weather forecasting
and terrestrial radiation (absorption, reflection, and scattering). Cloud physics is another key area of investigation, alongside the study of aerosols
Meteorology
Narrow corridor of concentrated moisture in the atmosphere
tropical plume, tropical connection, moisture plume, water vapor surge, and cloud band. Atmospheric rivers consist of narrow bands of enhanced water vapor
Atmospheric_river
CLOUD PHYSICS
CLOUD PHYSICS
Boy/Male
Tamil
Cloud
Boy/Male
Hindu, Indian, Sanskrit
Cloud; Rainy Clouds
Girl/Female
Tamil
Cloud
Boy/Male
Tamil
Cloud
Girl/Female
Tamil
Ambudhara | à®…à®®à¯à®ªà¯à®¤à®¾à®°à®¾
Cloud
Ambudhara | à®…à®®à¯à®ªà¯à®¤à®¾à®°à®¾
Boy/Male
Tamil
Cloud
Boy/Male
Tamil
Cloud
Girl/Female
Tamil
Cloud
Surname or Lastname
English
English : nickname for a noisy person, from Middle English lude ‘loud’ (Old English hlūd), perhaps in part preserving the Old English byname Hlūda that Ekwall postulates to explain the place names Loudham (Suffolk) and Lowdham (Nottinghamshire).English : topographic name for someone who lived by a roaring stream, Old English hlūde or hl̄de literally ‘the loud one’, or a habitational name from any of the places named from hl̄de, for example Lyde in Herefordshire and Somerset.English : variant of Louth.
Girl/Female
Tamil
Cloud
Male
English
English form of French Claude, CLAUD means "lame."
Boy/Male
Arabic, Hindu, Indian, Muslim, Sindhi
Cloud that Carries Rain; Prophet Name; Rain Clouds
Girl/Female
Tamil
Cloud
Boy/Male
American, Australian, British, Christian, Dutch, English, French, German, Indian, Latin
Lame
Boy/Male
Tamil
Cloud
Girl/Female
Tamil
Cloud
Surname or Lastname
English
English : topographic name for someone who lived near an outcrop or hill, from Old English clÅ«d ‘rock’ (only later used to denote vapor formations in the sky).French : from the Germanic personal name Hlodald, composed of the elements hlÅd ‘famous’, ‘clear’ + wald ‘rule’, which was borne by a saint and bishop of the 6th century.
Boy/Male
Tamil
Cloud
Girl/Female
Tamil
Cloud
Boy/Male
Welsh
Lame.
CLOUD PHYSICS
CLOUD PHYSICS
Boy/Male
Muslim
The just one
Girl/Female
Tamil
Collection
Girl/Female
Tamil
Amolika | அமோலிகா
Priceless
Male
Russian
(Панкратий) Russian form of Greek Pankratios, PANKRATIY means "all power."
Girl/Female
Tamil
Brightness
Girl/Female
Bengali, Finnish, Gujarati, Hindu, Indian, Japanese, Sindhi, Tamil
Atom; A Prefix; Tiny Part
Girl/Female
Hindu, Indian
Lakshmi and Parvathi; Goddess of Wealth and Courage; Name Came from Sun
Boy/Male
Indian
Knowing right from wrong
Boy/Male
Arabic
Sweet; Simple
Boy/Male
Hindu
A pair, A month of kerala midhunam
CLOUD PHYSICS
CLOUD PHYSICS
CLOUD PHYSICS
CLOUD PHYSICS
CLOUD PHYSICS
superl.
Having, making, or being a strong or great sound; noisy; striking the ear with great force; as, a loud cry; loud thunder.
a.
Having clouds resting on the top or head; reaching to the clouds; as, cloud-capped mountains.
n.
To cover with cloth, leather, or other material; to bandage; patch, or mend, with a clout.
n.
Cloud-gatherer; -- an epithet applied to Zeus.
n.
Overcast or obscured with clouds; clouded; as, a cloudy sky.
n.
Consisting of a cloud or clouds.
v. i.
To grow cloudy; to become obscure with clouds; -- often used with up.
n.
That which has a dark, lowering, or threatening aspect; that which temporarily overshadows, obscures, or depresses; as, a cloud of sorrow; a cloud of war; a cloud upon the intellect.
v. t.
To envelop in clouds; to cloud.
a.
Built of, or in, the clouds; airy; unsubstantial; imaginary.
superl.
Emphatic; impressive; urgent; as, a loud call for united effort.
adv.
With a loud voice, or great noise; loudly; audibly.
superl.
Ostentatious; likely to attract attention; gaudy; as, a loud style of dress; loud colors.
v. t.
To darken or obscure, as if by hiding or enveloping with a cloud; hence, to render gloomy or sullen.
n.
A rain cloud; one of the four principal varieties of clouds. See Cloud.
a.
Under the clouds; attended or partly covered or obscured by clouds; somewhat cloudy.
v. t.
To overspread or hide with a cloud or clouds; as, the sky is clouded.
v. t.
To mark with, or darken in, veins or sports; to variegate with colors; as, to cloud yarn.
n.
A sudden copious rainfall, as the whole cloud had been precipitated at once.
n.
A dark vein or spot on a lighter material, as in marble; hence, a blemish or defect; as, a cloud upon one's reputation; a cloud on a title.