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<br />003486 <br /> <br />The number of storms that satisfied our seedability criteria each <br />winter appears in Figures 3 through 7. '!his number averaged 19.7 for the <br />13 winters, ranging from 30 in 1970-71 to only 10 in 1963-64. Overall, <br />only 15 percent of the storms identified from soundings met the criteria <br />for seedability. Eighty-five percent of those not qualifying were <br />rejected because they were too cold. '!he remaining 15 percent were warm <br />enough but their 700 mb wind speed was outside the acceptable range. <br /> <br />'!he average number of seedable events per winter for dry, normal <br />and wet winters for each of the sub-regions is shown in Table 8. The <br />number of events that generated each average appears in parenthesis. <br /> <br />TABLE 8 <br />Average number of seedable events per winter for dry, normal and <br />wet winters for mountainous SUb-regions of Colorado <br /> <br /> Averaqe Number of Seedable Events Each Winter <br />Sub-region Dry Winters Normal Winters Wet Winters <br />North 19.3 (3) 17.2 (6) 23.8 (4) <br />South 22.5 (2) 17.0 (7) 23.0 (4) <br />West Central 16.0 (2) 19.7 (9) 23.5 (2) <br />East Central 16.3 (4) 20.8 (6) 22.0 (3) <br />Combined 16.0 (2) 19.7 (9) 23.5 (2) <br /> <br />Note: Number of winters that each average is based on appears <br />in parenthesis. <br /> <br />In the west central and east central sub-regions, the average number <br />of seedable events each winter increased with the wetness of the winter. <br />In the north and south sub-regions, the largest average also. occurred in <br />wet winters, but averages were higher in dry winters than in normal ones. <br /> <br />27 <br />