A very large convection cell that forms within a cumulonimbus by the merging of several smaller convective cells. Inside the supercell air may rise at 45 m/s and the cell may extend to a height of more than 16km, breaking through the tropopause. Supercells last much longer than ordinary convective storm cells, producing extremely violent storms, and they can trigger tornadoes. See also mesocyclone.
Subjects: Meteorology and Climatology.