a curious roll cloud appears in the sky of Uruguay

Maldonado, Uruguay - A type of cloud has rarely appeared in the sky over the beach of Las Olas in early January
It was a roller-type arcus cloud or roll cloud, a phenomenon so rare that NASA has done while his picture of the day on its site internet.ca cloud, as its name implies, the form of a roll. It is lower than other clouds (a few hundred meters) and appears during a storm. Several kilometers long, it is very impressive. There is another type of arcus: the gate of clouds, which as its name suggests a form barrière.Le a roll cloud forms in front of cold fronts and despite its appearance, which can be scary especially by stormy weather, there would be no risk that it becomes a tornado.