Rare 'roll cloud' phenomenon captured in dramatic timelapse footage
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Version 0 of 1. A rare roll cloud passed over the town of Tamarac in southern Florida this week. The tube-shaped cloud was captured in dramatic timelapse footage as it swept across the sky. Despite its appearance, this type of cloud is not a type of tornado or a biblical omen, but a low, horizontal formation caused by an outflow of cold air. A roll cloud is a type of arcus cloud. It is similar to a shelf cloud, but is unusually detached from the surrounding cloud features. The phenomenon can last for several hours and often appear on the edge of a thunderstorm.
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