Abstract
The difluent upper trough (with wind maximum behind the trough line) is shown to be an important part of the deepening mechanism of cyclones. The difluent structure of the upper trough may arise, 1, from initial difluence in the basic current, 2, by the formation of a new trough ahead of the speed maximum formed downwind from unstable anticyclonic curvature or, 3, by deformation of the trough in a basic current with cyclonic shear.
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