A strong supercell thunderstorm drops hail,with the WSR-88D Doppler radar at New Underwood,South Dakota May 26,2004. A supercell is a thunderstorm that is characterized by the presence of a mesocyclone: a deep,continuously-rotating updraft. For this reason,these storms are sometimes referred to as rotating thunderstorms. Of the four classifications of thunderstorms (supercell,squall line,multi-cell,and single-cell),supercells are the overall least common and have the potential to be the most severe |