Slow motion
A storm cell extend over an area the size of a few tens of square milles/kilometers and last 30 minutes or so. When the updraft and the environmental wind shear is well coordinated, the size and the duration of the cell can be much greater leading to a supercell. Finally, storm cells can form on the outflow of previous cells leading to multicellular thunderstorms or mesoscale convective systems. Slow motion of these more intense storm cells or groups of cells can produce large precipitation accumulations and flash flood, or other dangerous other phenomena like hail and tornadoes.