Thunderstorms vary in complexity. Some are small, single cell storms. Other storms have multiple cells, where a cell consists of an individual updraft and its accompanying downdraft inside the thunderstorm cloud. Individual cells last about an hour.
A typical multicell thunderstorm is made up of two to four cells at any given time. There is always at least one active cell within a multicell storm. Thunderstorms form and die out within the storm. Cells continue to form within the clouds as the multicell storm regenerates itself. A total of thirty or more cells may develop during the lifetime of a storm.