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Definition of the noun altocumulus

What does altocumulus mean as a name of something?

noun - plural: altocumuli / altocumulus (rare form)

  1. a cumulus cloud at an intermediate altitude of 2 or 3 miles

Alternative definition of the noun altocumulus


  1. [physics, meteorology] A principal medium-level cloud type, white and/or gray in color, which occurs as a layer or patch with a waved aspect, the elements of which appear as laminae, rounded masses, or rolls. These elements usually are sharply outlined, but they may become partly fibrous or diffuse; they may or may not be merged; they generally have shadowed parts; and, by convection, when observed at an angle of more than 30° above the horizon, subtend an angle between 1 degrees and 5 degrees. (Abbreviated 'A'c.)


Altocumulus is a middle-altitude cloud genus that belongs to the stratocumuliform physical category characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. Like other cumuliform and stratocumuliform clouds, altocumulus signifies convection. It is usually white or grey, and often occurs in sheets or patches with wavy, rounded masses or rolls. A sheet of partially conjoined altocumulus perlucidus is sometimes found preceding a weakening warm front, where the altostratus is starting to fragment, resulting in patches of altocumulus perlucidus between the areas of altostratus. Altocumulus is also commonly found between the warm and cold fronts in a depression, although this is often hidden by lower clouds. Towering altocumulus, known as altocumulus castellanus, frequently signals the development of thunderstorms later in the day, as it shows instability and convection in the middle levels of the troposphere, the area where towering cumulus clouds can turn into cumulonimbus.

  • also known as Altocumulus cloud

Printed dictionaries and other books with definitions for Altocumulus

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Google previewNational Geographic Family Reference Atlas of the World (2009)

by National Geographic Society (U.S.), John M. Fahey

Stratocumulus is a layered cumulus cloudaboutamia above thagound Altocumulus is a similar cloud at an alttude of two miles isgaatarsistanza from the groundmäkosthetumulus offs appearsmaller than those of stratocumulusciouds.

Google previewUnderstanding Weather (2014)

by Karel Karel Hughes, Julian Mayes

Altocumulus is a beautiful cloud that has been aptly described as resembling cumulus ripples where cumulus-like ...

Google previewPhysical Geography: a Landscape Appreciations (2009)

by K. Bharatdwaj

Altocumulus (Ac): Altocumulus is a greyish sheet cloud much denser than cirrostratus, but through which it is still possible to see the sun. It occurs in patch, sheet or layer. In general, it consists of mass of small, relatively thin, globular patches, ...

Google previewABC's of Versability (2015)

by Roger J. Maderia

An altocumulus is a cloud of white or gray. It's patchy with a puffy round outline. An apparition is a cloudy appearance. Quite often it seems like a ghostly sign. An anomaly does deviate from a norm. Ablution is the washing of one's hands.

Google previewMeteorology For Pilots (2014)

by Mike Wickson

AC – ALTOCUMULUS is a stability cloud ...

Google previewA Dictionary of Travel and Tourism Terminology (2005)

by Allan Beaver

Altocumulus is a frequently occurring 99 type.

Google previewPhoto-era Magazine (1918)

by Juan C. Abel, Thomas Harrison Cummings, Wilfred A. French, A. H. Beardsley

Altocumulus is a high floating-type, consisting of numerous rounded masses constituting a compact group, which is frequently great enough to cover a considerable portion of the sky. - In this form, it is often noticeable toward sunset on quiet ...

Google previewPhoto-Era 1918 (1918)

Altocumulus is a high floating-type, consisting of numerous rounded masses constituting a compact group, which is frequently great enough to cover a considerable portion of the sky. In this form, it is often noticeable toward sunset on quiet ...

Google previewVan Nostrand’s Scientific Encyclopedia (2013)

by Douglas M. Considine, Glenn D. Considine

Altocumulus is a middle-altitude water or mixed cloud, whose rounded masses or rolls are usually sharply outlined. It generally has shadowed parts, varying in color from pure white to nearly black. “Mackerel sky” is an appropriate description ...

Google previewDictionary of Earth Sciences (1976)

by S.E. Stiegeler

altocumulus (Ac), stratus (St), stratocumulus (Sc), cumulus (Cu), cumulonimbus ...

Google previewThe Facts on File Dictionary of Earth Science (2009)

by Jacqueline Smith

applied to altocumulus and stratocumulus clouds; nebulosus – exhibiting a nebulous veil with no distinct details, usually cirrostratus or altostratus; lenticularis – lens-shaped, with sharp margins (most commonly applied to altocumulus cloud ...

Google previewLewis' Dictionary of Occupational and Environmental Safety and Health (1999)

by Jeffrey Wayne Vincoli

altocumulus A middle cloud, usually white or gray. Often occurs in layers or patches with wavy, rounded masses or rolls. altocumulus castellanus An ...

Google previewEncyclopedia of Marine Science (2009)

by C. Reid Nichols, Robert G. Williams

Altocumulus clouds are the cumulus cloud masses organized in rows; the cloud elements may or may not be merged into one mass. Nimbostratus clouds are gray sheets of cloud from which rain is falling (the meaning of the prefix nimbo).

Google previewIllustrated Dictionary and Resource Directory of Environmental and Occupational Health, Second Edition (2016)

by Herman Koren

altocumulus clouds (Ac) — Patches or layers of puffy, ...

Google previewA Dictionary of Weather (2008)

by Storm Dunlop

altocumulus (Ac) One of the main *cloud genera: a middlelevel cloud (see ÉTAGE) that occurs as a layer or patch of more or less ...

Google previewEncyclopedia of Geography (2010)

by Barney Warf

altocumulus (Ac), altostratus (As), nimbostratus (Ns), cumulus (Cu), stratocumulus (Sc), stratus (St), and cumulonimbus (Cb). Additional classifications include species, ...

Google previewConcise Dictionary of Chemistry (2012)

by Editorial Board

altocumulus. A dappled layer of patch or cloud composed of flattened globules that may be arranged in ...

Google previewThe Wordsworth Dictionary of Abbreviations and Acronyms (1997)

by Rodney Dale, Steve Puttick

Cloud classification Ac altocumulus Cu cumulus Acc altocumulus castellatus Fc fractocumulus As altostratus Fn fractonimbus Cb cumulonimbus Fs fractostratus Cc cirrocumulus Nb nimbus ...

Google previewA Dictionary of Geography (2015)

by Susan Mayhew

altocumulus, Ac—shallow cloud sheet broken into roughly regular, rounded clouds; altostratus, As— featureless, thin, translucent cloud sheet; nimbus, Ns—extensive, very dark cloud sheet, ...

Google previewEncyclopedia of Earth and Space Science (2010)

by Timothy M. Kusky, Katherine E. Cullen

Altocumulus clouds are gray, puffy masses that often roll out in waves, Cirrus clouds over coast range at Purisima Creek Redwoods, Bay Area, California ( NOAA/Department of Commerce) with some parts appearing darker than others.

Google previewChildren's Illustrated Encyclopedia (2016)

by DK

Stratocumulus Altocumulus airmaSSeS and frontS Huge bodies of air, called air Warm,moistair WeatHer foreCaSting Warm front long spells of masses, form over land and sea. air masses containing mass the weather centers in different ...

Google previewThe Visual Encyclopedia of Our World - The Universe • Earth • Weather • The Oceans (2007)

Altocumulus clouds look like small, puffy gray or white rolls placed in rows side by side. They are not usually a sign of precipitation unless they are found together with altostratus clouds. Stratus Stratus clouds are low-hanging, ...

Google previewDictionary of Physics (2016)

by Palgrave Macmillan Ltd

Altocumulus clouds often herald Bothunderstorms. (B-clouds) altostratus, medium-height stratus cloud, As, a mixed cloud occurring at the intermediate level of the D-troposphere, usually in the form of a nonstructured or lightly striped, ...

Google previewThe Dictionary of Physical Geography (2015)

by David S. G. Thomas

altocumulus See CLOUDS. altostratus See CLOUDS. alveolar Alveolar or honeycomb weathering features take the form of small hollows in rock surfaces that may occur as individual features but more commonly are ...

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Small photo of Dramatic skies with Lenticular cloud Altocumulus lenticularis in sunsetSmall photo of Lenticular cloud (Altocumulus lenticularis) over the mountains - The Tatra MountainsSmall photo of scatter altocumulus or cirrocumulus cloud, mackerel skySmall photo of Sky and clouds altocumulus in the morningSmall photo of Sky and clouds altocumulus in the morningSmall photo of Sky and clouds altocumulus in the morningSmall photo of Sky and clouds altocumulus in the morning More...

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Altocumulus Meaning

Video shows what altocumulus means. A principal medium-level cloud type, white and/or gray in color, which occurs as a layer or patch with a waved aspect, the ...

Scrabble value of A1L1T1O1C3U1M3U1L1U1S1

The value of this 11-letter word is 15 points, but it's not an accepted word in the Official Scrabble Players Dictionary.

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