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<br />precipitation from seedable upslope cloud systems. Morning precipita- <br />tion is the most frequent, although the preference for morning oc- <br />currences is the least pronounced in the central High Plains. In <br />comparison, figure 7 shows that about 55 percent of all precipitation <br />produced in shallow upslope cloud systems also occurs in the morning. <br />The intensity of precipitation from a seedable upslope cloud <br />system can be plotted against meteorological statistics describing the <br />cloud and its environment. Figures 16 to 19 show the means and stand- <br />ard deviations for each of four variables (cloud thickness, cloud top <br />temperature, lapse rate, and upslope wind component) for each intensity <br />group for each region of the High Plains. <br /> <br />j <br />1 <br /> <br />CLOUD THICKNESS VS PRECIPITATION INTENSITY <br /> <br />Cloud ThIckness <br />(Meters) <br /> <br />3800 <br /> <br />+1 std dev <br /> <br />2600 <br /> <br />, mean <br /> <br />Figure 16: Cloud thickness <br />(meters) versus precipitation <br />intensity for regions of the <br />High -Plains. Means and stand- <br />ard deviations of cloud thick-. <br />nesses are shown. The co lwrrn <br />"pooled data" gives aloud <br />thickness statistics for each <br />region regardless of precipita~ <br />tion intensity. <br /> <br />3400 <br /> <br />3000 <br /> <br />2200 <br /> <br />1800 <br /> <br />1400 <br /> <br />1 std dev <br /> <br />1000 <br /> <br />600 <br /> <br />.. Northern Plains <br />. Central Plains <br />. Southern Plains <br /> <br /> <br />24 <br />