The results of two numerical simulations are presented. The first shows the classic deviatory motion of a multicell system, to the right of the mean tropospheric wind. The second, having a more highly sheared environment, produces a storm which splits into two after the formation of a wedge‐shaped downdraught outflow. Both simulations highlight the important role played by the downdraught dynamics in establishing a regenerative forcing mechanism. In the higher shear case the updraught core exhibits a large downshear slope with rain falling into the inflow region, thus producing a split updraught core and eventually two distinct cells. The strength and direction of the relative inflow lead to the different structures and life histories of the two storm systems. The importance of the flow relative to the cell is demonstrated by considering the effects of Galilean transformations of the coordinate system.
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Thorpe et al. (1978) studied this question.