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<br />5. Comparison with observations <br /> <br />A search of the hydrometeorological literature was made to obtain informa- <br />tion on observed isohyetal patterns with which to relate the theoretical <br />patterns to the "real-world" domain. The results of this study (section 3) <br /> <br />showed that storm precipitation gradient, area, and shape were of primary <br /> <br />interest. The reported data wer'e of two types: 1) area-depth rel ationshi ps <br />from which the required information could be mathematically derived and <br />2) isohyetal maps from which the! required information could be graphically <br />derived. The primary sources of data on area-depth precipitation relationships <br />were Court (1961) who provided a. summary of work by hal f a dozen investigators <br />in the United States and Europe, Huff (1968a) who summarized 11 years of <br /> <br />hydrometeorological research on heavy storm rainfalls in Illinois, Huff <br />(1967) who discussed rainfall gradients in Illinois warm-season storms, and <br />Fogel and Duckstein (1969) who considered convective rainfall in Arizona. <br />Selected isohyetal maps from METROMEX 5 and HIPLEX 6 were planimetered to <br />obtain the second type of data. Precipitation characteristics of Florida <br />showers and thunderstorms reported by Woodley et ale (1971 and 197!5) were <br /> <br />also used. Table 2 summarizes the relevant storm precipitation characteristics <br /> <br />deri ved from both types of data.. <br /> <br />5Studies of Selected Precipitation Cases from METROMEX, S. A. Chan~Jnon <br />and R. G. Semonin, Editors. IS~S RI-81/75, Report of Investigation 81, <br />Illinois State Water Survey, Urb,ana, Illinois,1975. <br />6Middleton, J. R., 1978: Radar observed characteristics of summertime <br />echoes in eastern Montana. Preprints of the 18th Conference on Radar Meteorology, <br />March 28-31, 1978, Atlanta, Geor9ia, American Meteorological Society, Boston, <br />Massachusetts. <br /> <br />13 <br />