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Stratus clouds do not produce accessory clouds, but a supplementary feature praecipitatio is derived from Latin, which means "precipitation". Stratus clouds are generally too low to produce virga, or rain shears that evaporate before reaching the ground, although higher stratus clouds can produce it.
At level with stratus nebulosus translucidus (V-90) and opacus (V-91) clouds Stratus fractus (V-89) cloud. Abbreviation: St [9] Clouds of the genus stratus form in low horizontal layers having a ragged or uniform base. Ragged stratus often forms in precipitation while more uniform stratus forms in maritime or other moist stable air mass conditions.
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.
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Cumulonimbus, the largest of all cloud genera, has the capacity to produce very heavy showers. Low stratus clouds usually produce only light precipitation, but this always occurs as the feature praecipitatio due to the fact this cloud genus lies too close to the ground to allow for the formation of virga. [77] [87] [92]
Volutus clouds are much more common in the form of stratocumulus, as opposed to altocumulus volutus. [4] Stratocumulus volutus clouds are not severe, and may only bring several minutes of rain. [5] Alternatively, stratocumulus volutus clouds may form with numerous layers, contradicting the usual rounded form. [6]
Clouds and potentially fog can form within a marine layer when the water-saturated air is cooled and reaches a humidity of 100%, where it will then condense and turn into water droplets. [3] Stratus and stratocumulus can form at the top of a marine layer in the presence of these conditions. A marine layer can often be dispersed by sufficiently ...
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.