Cloud roll captured on camera

This picture shows a rare phenomenon called a roll cloud which tend to form ahead of a cold front and can stretch for miles.

They are most common when an advancing storm front causes moist air to rise, then cool to the point where it becomes a cloud known as the dew point.



When this happens along a front, a roll cloud can form, often with air actually circulating along the horizontal axis of the cloud.

Photographer Daniela Eberl took this snap at Las Olas Beach in Maldonado, Uruguay.