Ordinary cell

From Glossary of Meteorology

ordinary cell

The most basic component of a convective storm, consisting of a single main updraft that is usually quickly replaced by a downdraft once precipitation begins.

Ordinary cells are especially observed in environments with weak vertical wind shear, and typically have lifetimes of 30–50 minutes. Ordinary cells are the primary component of multicell storms.
See also convective cell, multicell convective storm, thunderstorm.