altocumulus cloud


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altocumulus cloud

[¦al·tō¦kyüm·yə·ləs ′klau̇d]
(meteorology)
A principal cloud type, white or gray or both white and gray in color; occurs as a layer or patch with a waved aspect, the elements of which appear as laminae, rounded masses, or rolls; frequently appears at different levels in a given sky. Abbreviated Ac.
References in periodicals archive ?
Mid-level altocumulus clouds can be banded or rounded in formation.
EVENING GLOW: Brian Hutchinson of Hartburn, Stockton, photographed this spectacular sky of altocumulus clouds in Hartburn, left; GO WITH THE FLOW: Young photographer, Laina Christie, aged ten, captured this peaceful stream and woodland near Osmotherley, below; NATURE: A Mistle Thrush in the snow, photographed by Brian Swales of Letch Lane, Stockton, on January 3, above.
The thick and rippling milky puffs of midlevel, altocumulus clouds that often herald the approach of wetter weather are sometimes known as a buttermilk sky.