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Altostratus duplicatus is a rare form of altostratus clouds composed of two or more layers of cloud. [8] Translucidus is a translucent form of altostratus clouds, meaning that the sun or moon can be seen through the cloud, [9] whereas the opacus variety is opaque. [10] Radiatus is another rare variety.
Altocumulus lenticularis (Ac len lenticular cloud) is a lens-shaped middle cloud which can resemble flying saucers and may occasionally be mistaken for "unidentified flying objects". This is formed by uplift usually associated with mountains. but usually with at least some grey shading. It is coded C M 4 on the SYNOP weather observation.
The list of cloud types groups all genera as high (cirro-, cirrus), middle (alto-), multi-level (nimbo-, cumulo-, cumulus), and low (strato-, stratus). These groupings are determined by the altitude level or levels in the troposphere at which each of the various cloud types is normally found.
The altitude, form, and thickness of the clouds are the main factors that affect the local heating or cooling of the Earth and the atmosphere. Clouds that form above the troposphere are too scarce and too thin to have any influence on climate change. Clouds are the main uncertainty in climate sensitivity. [2]
Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...
Elements within the cloud (such as the edges of the undulations) are generally darker than those in cirrocumulus and smaller than those in stratocumulus. These clouds may appear both as patches or as covering the sky. The width of these clouds is generally less than 300 feet (91 meters) thick.
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Lacunosus cloud types (including this one) forms when a layer of cold air and a layer of warmer air come in contact with each other. This then causes the cold air to sink in the form of localized downdrafts. These downdrafts then strike through the cloud and create the holes. [2] [3]