A long, tubular cloud that appears to roll about a horizontal axis. Often forms along the leading edge of a storm front or gust front. Indicates a change in wind direction and can precede severe ...

So what are mammatus clouds? And what do they signal is coming? Mammatus clouds often form on the base of storm clouds but can be associated with other types of clouds as well. NOAA describes them ...

MOLINE, Ill. — Storm clouds come in many shapes and sizes, but what about their colors? What can that tell us about a particular storm? That's a question John from Milan, Illinois, submitted ...

Even though mammatus clouds themselves are harmless, they are often harbingers of a dangerous storm nearby, so if you see them in the sky, take caution. Given these stunning clouds are often ...

The storm seemed headed out to sea, but intent on taking a scenic route, it then made a hard right turn. Vacationers along the Outer Banks were in for an unforgettable display of clouds and ...