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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 ]
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.
Genus altostratus (As) – Altostratus is a midlevel opaque or translucent nonconvective veil of gray/blue-gray cloud that often forms along warm fronts and around low-pressure areas. Altostratus is usually composed of water droplets, but may be mixed with ice crystals at higher altitudes.
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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]
[3] [6] They can also form from altostratus and nimbostratus clouds, either as evaporating precipitation condenses into a cloud or as the nimbostratus cloud itself thins and breaks up. If a cumulus cloud becomes flattened (for example, by wind shear or temperature inversion), it too can become a stratocumulus cloud. [6]
The latter can achieve heavy intensity due to the cloud's vertical depth. Accessory cloud: Nimbostratus pannus is an accessory cloud of nimbostratus that forms as a ragged layer in precipitation below the main cloud deck. [11] Pannus is coded C L 7. Genitus mother clouds: This genus type can form from cumulus and cumulonimbus.
A major cold blast is in store for more than 30 states as a widespread arctic air outbreak will send nearly every American east of the Rockies into a deep freeze.