Instability creates rapid storm development, moisture drives updraft speed, and wind shear generates mesocyclone rotation. Stronger updraft speeds in the supercell create larger hailstones.

A supercell is a unique type of thunderstorm characterized by a rotating updraft known as a mesocyclone. The term "mesocyclone" refers to the small-scale circulation occurring in a storm.

Last year's storm season saw this mesocyclone and green glow caused by very large hail amid a tornadic high precipitation supercell in Hennessey, Okla., as pictured on May 7, 2024. (Matt Phelps ...

"What makes a supercell unique from all other thunderstorm types is that it contains a deep and persistent rotating updraft called a mesocyclone. If the environment is favorable, supercell ...

A supercell thunderstorm loomed over York County Tuesday, impressively captured in a dramatic drone photo by Kari Smith.