Nancy Ricigliano, friend of George Preoteasa (Member 41,445), spotted this long tube of cloud over the south shore of Long Island, New York, US. It is called a Stratocumulus volutus, or roll cloud, and was likely the result of the interplay between a cool sea breeze and air from the Sun-warmed land. Roll clouds are rare – unless you live by coastal waters, which is where they most often appear. Volutus clouds tend to travel, rolling as they move – but not quite as you might expect. They don’t roll like a rolling pin along the ground. Instead, the front of the cloud lifts up as it progresses, sometimes at speeds up to 35-40 mph (55-65 km/h), and the back of the cloud sinks down. Clouds, as ever, like to do things their own way.