A theoretical basis is provided for the estimation of trajectories in the downdraft and temperatures along the trajectories. The experimental results of other investigators have been combined to provide a basis for the evaluation of cooling due to evaporation. It is shown that below 425 mb rain effects are capable of producing a steady state downdraft which can balance the mass transport of the updraft of a severe storm. The importance of vertical shear and the mutual self-sustaining interaction of updraft and downdraft through the upshear rain distribution are demonstrated by modelling a storm, based on the Wokingham storm, in the wind and temperature environment of an occasion of severe storms in Queensland.
Spillane et al. (1969) studied this question.