Supercells, sometimes called rotating thunderstorms, are formed by a deep, constantly rotating updraft of wind. In the United States, the devastating storms are most common in the famed "Tornado Alley." #WowScience Credit: Colt Forney
"Wave In The Sky". The severe thunderstorm near Graham, Texas yesterday (4-18-15) created a "Breaking Wave" shape as it started to intensify. I still can't get over the magnificent variation of blues it was displaying.