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 ...

There are different kinds of storm clouds that can be concerning and some that are not. Mammatus clouds can create quite the sight in the sky. They form the same way a typical funnel cloud does ...

They are Mammatus clouds. Mammatus are small, pouch-like clouds hanging underneath the base of a storm cloud. Mammatus clouds indicate a turbulent atmosphere somewhere close. The clouds are formed ...