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<br />UPSLOPE' 'SEEDABLE' SITUATIONS <br /> <br /> <br />Percentage of <br />1200GMT Occurrences <br />Relative to the Total Number <br />of 00 & 1200GMT -Occurrences <br /> <br />Figupe 7: Peraentage of morning <br />(1200 GMT) oacuprenaes of seed- <br />able 'Upslope aloud systems <br />relative to the total number <br />of morning and evening (0000 <br />GMT) oaauprenaes. <br /> <br />Figure 8 shows the monthly distribution of seedable upslope cloud <br />systems for the three regions of the High Plains, and the average <br />monthly distribution for the entire area. The number of upslope <br />systems in the northern High Plains differs little from month to month, <br />although slightly more do occur in February, March, and April. The <br />graph suggests that additio~al upslope seedable cloud systems prob- <br />ably arise later in the spring. Midwinter (December through March) <br /> <br />is the favored time for these conditions in the central High Plains. <br /> <br />13 <br />