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 ...

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 ...