The data collected by means of the C-130 of NCAR during SCMS were kindly supplied by Dr. C. A. Knight. We acknowledge NCAR and its sponsor, the National Science Foundation, for the use of the observational data. We thank Piet Jonker for his computer programming support and Stephan de Roode for many discussions. We are grateful to three anonymous referees for their useful comments and suggestions.
This article would not have seen daylight without the support, suggestions, positive criticism, and ceaseless enthusiasm of Peter Duynkerke. The sudden loss of our colleague and friend has been a great shock. We hope that his ideas are clearly articulated in this paper.
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