Roll clouds are officially known as Volutus clouds and form in a fashion similar to the shelf cloud that precedes a thunderstorm, but is not attached to a thunderstorm, and in fact, most often ...

A roll cloud, lit by the sunrise in Richmond, Virginia, on Feb. 5, 2018. (Bill Hark) Roll clouds are officially known as Volutus clouds and form in a fashion similar to the shelf cloud that precedes a ...