Английская Википедия:Altocumulus volutus
Altocumulus volutus is a type of altocumulus cloud. This cloud type has the appearance of a single, small, horizontal, rolling line, it is relatively rare compared with its counterpart stratocumulus volutus,[1] This cloud does not attach to any other cloud. It may or may not appear with altocumulus clouds of different species. When found in a thunderstorm, it forms when cold air from a thunderstorm's downdraft makes the already present warm and moist air rise, expanding and cooling as it rises. It then condenses, although the most likely scenario is that it condenses into a shelf cloud or roll cloud, rather than an altocumulus volutus cloud.[2] When found in environments where it is not associated with a thunderstorm, it forms because of wind shear (difference of wind speed and direction between the mid-levels of the atmosphere and the surface).[3]
References
Шаблон:Reflist Шаблон:Cloud types
