Interesting Images:
A rare tube-shaped cloud created a spectacle in northern Virginia yesterday (Sept. 16) as it crept across the sky.
Roll clouds belong to a family of low-forming clouds known as arcus clouds. They are related to the more common, wedge-shaped shelf cloud.
Shelf clouds often form on the leading edges of thunderstorms (or sometimes a cold front) as rain-cooled air ploughs under the warm, moist air that's closer to the ground. This warm, moist air is forced upwards and its water vapor condenses into the scary-looking cloud formation.
Roll clouds are sometimes born out of a thunderstorm's gust front, too, and they are "rolled" into shape by storm winds. But unlike shelf clouds, rolls clouds are not attached to the rest of a storm or any other cloud formation.
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