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.
