Rotating Wall Cloud
Slide 34 of 95
Most strong and Violent tornadoes occur with supercell thunderstorms. A supercell storm is characterized by rotation within the storm. Typically, this area of rotation occurs in the south side of the storm. Visually, a low-hanging cloud base with rotation is often seen. This area may or may not be visible since rain sometimes wraps around the area of circulation.
Rotating wall cloud with very dark sky in background near Lahoma, Oklahoma. (Greg Stumpf)