Harold Brooks Browse All Authors Famous Quotes by Harold Brooks A man stands atop a smashed car in a tornado-ravaged neighborhood south of Oklahoma City. The F5 tornado killed some 44 people in May 1999. ( Reuters) Most tornadoes form from supercells, also known as a rotating thunderstorm or a mesocyclone. A supercell is typically a thunderstorm with the winds already in motion, according to National Geographic. It requires a combination of warm, moist air and cold, dry air which are the ingredients for a regular thunderstorm. Harold Brooks science
