Roll clouds were part of an amazing sunrise in Scotland County early Tuesday morning, September 13th. A roll cloud is a low, horizontal, tube-shaped and relatively rare type of arcus cloud, a category of low cloud formations. Roll clouds form near advancing cold fronts. A downdraft from the advancing storm front can cause moist warm air to rise, cool below its dew point, and so form a cloud. When this happens uniformly along an extended front, a roll cloud may form. They differ from shelf clouds by being completely detached from a thunderstorm base or other cloud features. They usually appear to be “rolling” about a horizontal axis.