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Related to altocumulus: cirrocumulus, cirrostratus


see cloudcloud,
aggregation of minute particles of water or ice suspended in the air. Formation of Clouds

Clouds are formed when air containing water vapor is cooled below a critical temperature called the dew point and the resulting moisture condenses into droplets on
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altocumulus (Ac)

altocumulus (Ac)
Elliptical globular cloud units occurring individually or in groups. They may have gray shading on their undersurface. Most individual clouds are frequently elongated elliptical or lenticular units and are distinguished from cumulus by their height and lack of vertical doming. Thin altocumulus clouds are represented on weather charts as image.
References in periodicals archive ?
This radar triad at Addu Atoll provided unprecedented observations of the entire tropical cloud population, including precipitating and nonprecipirating shallow cumulus clouds, midlayer altostratus and altocumulus, convective congestus, isolated deep convective clouds, upper-level anvil and cirrus clouds, mesoscale convective systems, and hydrometer types.
But as the week closed, tangible evidence of this pattern brought middle level altocumulus across the central and southerly parts of the country, ahead of and in conjunction with the initial trough.
The phenomenon is similar in appearance to the colorful atmospheric coronas that occasionally ring the Sun or Moon, when they are covered by altocumulus clouds.
Although there's clear blue sky with a few bands of altocumulus, the sky to the north looks like a sea of towering cumulus.
A major trough passed quickly south of the Cape, only to be succeeded even quicker by another system, while a northwesterly drift persisted aloft, as witnessed by several successive morning's turbulent altocumulus sheets.
Such a cloud formation, either Altocumulus Castellanus or Altocumulus of a chaotic sky, are both described as precursors of thundery weather.
Though a roll cloud may not be seen, strong chinooks are often accompanied by spectacular multiple-layered standing lenticular clouds ("altocumulus standing lenticular" or ACSL) and a chinook arch, a broad mid-level altocumulus or cirrus cloud extending leeward from the mountains.
The past few days, we were spectators to this volatility and the reflex which kept a shallow (some hundreds of feet deep) moister inflow, its visual identity was altocumulus revealing considerable instability, generally limited vertical cloud development, yet showers occurred around Rehoboth on Tuesday morning among other reported points.