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Altostratus clouds are usually gray or blueish featureless sheets, although some variants have wavy or banded bases. The sun can be seen through thinner altostratus clouds, but thicker layers can be quite opaque. Altostratus clouds usually predict the arrival of warm fronts. Once altostratus clouds associated with a warm front arrive ...
Clouds of the genus nimbostratus tend to bring constant precipitation and low visibility. This cloud type normally forms above 2 kilometres (6,600 ft) [10] from altostratus cloud but tends to thicken into the lower levels during the occurrence of precipitation. The top of a nimbostratus deck is usually in the middle level of the troposphere.
The altostratus undulatus is a type of altostratus cloud with signature undulations within it. These undulations may be visible (usually as "wavy bases"), but frequently they are indiscernible to the naked eye.
Translucidus is a cloud variety. It appears in altocumulus, altostratus, stratus, and stratocumulus clouds. The cloud variety is very recognizable, with its defining feature being that it is translucent, and that it gives away the location of the Sun and Moon. Sometimes, it lets stars in the night sky be visible. [1]
Cloud species are a set of fourteen terms used to describe the shape and structure of clouds. Each one has its name abbreviated to a three letter term. [1] [2] [3]
Altocumulus and Altostratus are the main cloud types found in the middle levels of the troposphere. The low étage is found from surface up to 2,000 m (6,500 ft) at all latitudes. Principal cloud types found in the low levels of the troposphere include stratocumulus , stratus , and small fair weather cumulus .
Opacus is a cloud variety that is found in stratocumulus, altocumulus, altostratus, and stratus cloud types. This cloud variety has a dark and opaque appearance and hides the location of the Sun and Moon. This makes it the opposite of translucidus, which is translucent and gives away the location of the Sun and Moon. [1]
Mutatus mother clouds: Cirrostratus fibratus cirromutatus or cirrocumulomutatus are the result of a complete transformation from cirrus and cirrocumulus genus types. Cirrostratus nebulosis altostratomutatus results when a high grey nebulous altostratus layer thins out into a whitish layer of featureless high cloud. [8]