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<br />UPSLOPE' 'SEEDABLE' SITUATIONS <br />80 12 <br /> <br /> <br />Number of Occurrences <br />.10 year period Sep - Apr <br /> <br />Figure 5: The nwriber of oaaur- <br />~naes (September through <br />April) of seedable upslope <br />aloud systems as indiaated <br />from all ~nsonde observa- <br />tions in a 10 Y~aP period. <br /> <br />UPSLOPE' 'SEEDABLE' SITUATIONS <br /> <br /> <br />Number of Occurrences <br />00 & 1200GMT Rawlnsondes <br />10 year period Sep - Apr <br /> <br />Figure 6: Nwriber of seedable up- <br />slope aloud systems (September <br />through April) as indiaatedon <br />0000 and 1200 GMT rawinsonde <br />data for a 10 year' period. <br /> <br />3. A low tre4uency of occurrent;e of seedable upslope systems <br />exists in the southern High Plains. <br />Figure 7 gives the percentage of morning occurrences (i.e., at 1200 <br />GMT) of seedabl~ upslope conditions compared with the total number of <br />events at 0000 and 1200 GMT. The western High Plains has a higher <br /> <br />4' <br />, <br />i <br />i <br /> <br />,I <br /> <br />percentage of morning occurrences than the eastern High Plains stations, <br />although morning occurrences are the most frequent at all stations. <br /> <br />12 <br />