Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A cloud formation of rounded, fleecy, white or gray masses.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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 Ac.)

Etymologies

Latin altus, high.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • He proposes they be called altocumulus undulatus asperatus.

    Archive 2009-06-01

  • Above 6,500 feet can be found altocumulus ("clumps or rolls") and altostratus (a "drab and featureless" haze), as well as the storm clouds nimbostratus ("dim, miserable") and cumulonimbus ("the shape of a blacksmith's anvil").

    Cirrus Concerns

  • Jellyfish-shaped altocumulus clouds in the mid-atmosphere, trailing precipitation The impulse to collect can take strange forms.

    Cirrus Concerns

  • Altostratus and altocumulus are in the midrange, lie between one and a half and three miles above the sea.

    MY EMPIRE OF DIRT

  • Since moving to the eastern slope of the Rocky Mountains I have enjoyed frequent sightings of spectacular altocumulus standing lenticularis or lenticular cloud formations.

    Rich Wolf: Boulder UFOs Identified (Photos)

  • Since moving to the eastern slope of the Rocky Mountains I have enjoyed frequent sightings of these spectacular altocumulus standing lenticularis or lenticular cloud formations.

    Rich Wolf: Boulder UFOs Identified (Photos)

  • Above the surface location of the cold front, high altitude cirrostratus and middle altitude altocumulus clouds are common.

    Air masses and frontal transitional zones

  • To the West, lenticular altocumulus not the mountain wave type, but the over riding cold pool type indicative of big changes ahead.

    Unthreaded #20 « Climate Audit

  • Cellular interaction networks should be viewed, not as altocumulus clouds, “i.e., cotton ball-like structures sparsely connected by thin wisps”, but instead as the “continuous dense aggregations of stratus clouds”.

    Archive 2006-10-01

  • At sunset altocumulus clouds shaped like giant cuttlefish had turned blood red, a sure sign the winds would come that night.

    The Merlot Murders

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