DIVERGENCE

Wind movement that results in a horizontal net outflow of air from a particular region. Divergence at lower levels is associated with a downward movement of air from aloft. Contrast with convergence.

The expansion or spreading out of a vector field; usually said of horizontal winds. It is the opposite of convergence . Divergence at upper levels of the atmosphere enhances upward motion, and hence the potential for thunderstorm development (if other factors also are favorable).