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<br />4.3.3 Cloud thiakness <br /> <br />Shown in figure 13 are the heights of moist layer bases and moist <br />layer tops for seedab1e moist layers that occurred at Denver, C~lorado, <br />in 1961 through 1966. Information is also presented on the occurrence <br /> <br />or nonoccurrence of natural precipitation from these cloud systems. <br /> <br />Note that the thickest moist layers frequently are associated w'ith <br />precipitation and that the layers having bases closest to the surface <br /> <br />are the most frequent producers of precipitation. Close examination <br />of figure 13 shows that in these cloud systems nature fails to pro- <br />duce precipitation in 50 percent of the potential cases. Mean moist <br />layer thicknesses for all the High Plains rawinsonde stations are <br /> <br /> 'SEEDABLE' MOIST LAYER HEIGHTS <br /> Denver, Colorado <br />Height <br />ikrn-msll ~ Precipitation in progress <br />6 <br />5 - I <br /> 'I II, <br /> II , <br />4- ' I II I III <br />I, I. I III <br /> III I III \I I 1\1 I I <br /> I I III I I <br /> II I III I I <br /> III II " 11'1, II I " II' <br />3 III 'I " II" I 1\ " II II, , <br /> III II II ' II II IIII III \1" <br /> 'I' II ': III III 1111 <br /> II II 'I I1I1 <br /> II II I I I II' III' <br /> II , I II " I <br />2 : I I I I II ,I I III I" <br /> I II' , I <br /> I 0 J)enver II II' I <br /> I <br /> 1961 1962 1963 1964 1965 1966 <br /> <br />Figure 13: Height of moist layeY' tops and bases foY' individual seed- <br />able upslope a,loud layeY's at DenveY', ColoY'ado, as deter>mined by <br />Y'awinsonde obseY'vations in 1961 thY'ough 1966. Dashed lines in- <br />diaCfte pY'eaipitation in pY'ogY'ess at the time of Y'elease .of the <br />Y'aw'l-nsonde. <br /> <br />19 <br />