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An increase in the separation of the streamlines in a flow such as an airstream. It is the opposite of confluence and may be considered as an increase in the area covered by the flow. It is generally accompanied by a decrease in wind speed downwind, and a decrease in pressure. Diffluence in a jet stream, with the corresponding reduction in pressure at height, is a major factor governing the formation of depressions. See also convergence; divergence.

Subjects: Meteorology and Climatology.

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