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<br />fallout of the precipitation. The multicell storm consists at any <br />one time of several cells in different stages of development. <br />Studies of multicellular storms concerned with size, duration and <br />intensity of cells in High Plains thunderstorms include those of <br />Dennis et al. (1970) which dealt with hailstorms in western South <br />Dakota; Chisholm and Renick (1972), who described characteristics of <br />Alberta hailstorms; Newton and Fankhauser (1975) and Chalon et al. <br />(1976), who analyzed an event in northeast Colorado; and Marwitz <br />(1972b), who summarized features of such storms observed both in <br />Alberta and Colorado. Several common characteristics emerged from <br />these investigations. In terms of precipitation development, each <br />cell has been supposed to be independent, acting as if it were <br />isolated. Hail embryos are postulated to grow in an early stage of <br />cell development when the updraft is relatively weak, and complete <br />their growth during the mature phase of the cell when the stronger <br />updraft can support them. Multicell storms are thought to be poten- <br />tially susceptible to hail suppression by seeding individual cells <br />very early in their lifetimes, inducing competition between embryos <br />and reducing ultimate hail size. <br /> <br />Severe storms and cumulus clouds in general are complicated and <br />confusing phenomena, and either of these two concepts represents only <br />a useful simplification for deciding what is important in hail and <br />rain formation. <br /> <br />Recent results from the National Hail Research Experiemnt <br />(NHRE) showed the complex dynamics of hail-producing thunderstorms. <br />Fankhauser (1982) found that the equivalent potential temperature <br /> <br />1~ <br />