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<br />shown in figure 14. A steep gradient of thickness exists in the south- <br />eastern High Plains; an axis of high thickness values runs from <br /> <br />eastern Oklahoma northwestward to central Montana. The temperature <br />criterion in the model causes mean thicknesses to be low in the colder <br /> <br />sections of the High Plains and high in the warmer southern sections. <br /> <br />4. J. 4. Precipitating 'layers: frequenay of occurrence and <br />intensity of precipitation <br /> <br />Surface observations, taken while the rawinsondes were released, <br /> <br />were inspected and any natural precipitation noted. Figure 15 shows <br />the percentage of seedable episodes accompanied by natural precipita- <br />tion. Table 2 divides the precipitation occurrences into precipita- <br />tion intensity classifications. These classifications are used for <br /> <br />UPSLOPE' 'SEEDABLE' SITUATIONS <br /> <br /> <br />Moist Layer Thickness (meters) <br /> <br />Figure 14: Mean atoud thicknes; <br />(meters) . <br /> <br />I <br />J <br />t.l <br /> <br />!,' <br /> <br />20 <br />