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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.
Scud cloud (informal term for WMO species fractus) – ragged detached portions of cloud that usually form in precipitation. Sea of clouds; Shelf cloud (informal term for WMO supplementary feature arcus) – wedge-shaped cloud often attached to the underside of Cb. Stratus fractus (WMO genus and species) – ragged detached portions of stratus ...
Precipitation occurs when evapotranspiration takes place and local air becomes saturated with water vapor, and so can no longer maintain the level of water vapor in gaseous form, which creates clouds. This occurs when less dense moist air cools, usually when an air mass rises through the atmosphere to higher and cooler altitudes.
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Stratus fractus clouds on the other hand, appear with an irregular shape, and forms with a clearly fragmented or ragged appearance. [6] They mostly appear under the precipitation of major rain-bearing clouds; these are nimbostratus and cumulonimbus clouds, and are classified as types of pannus clouds.
Pannus, [1] or scud clouds, [2] is a type of fractus cloud at low height above ground, detached, and of irregular form, found beneath nimbostratus, cumulonimbus, altostratus and cumulus clouds. These clouds are often ragged or wispy in appearance.
Stratocumulus clouds usually form from the rising and breakup of a stratus cloud. [ 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.
Nimbostratus with virga. These clouds have low- to mid-level bases that form anywhere from near the surface to about 2,400 m (8,000 ft) and tops that can extend into the mid-altitude range and sometimes higher in the case of nimbostratus.