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<br />UPSLOPE' 'SEEDABLE' SITUATIONS <br /> <br /> <br />Moist Layer Base (meters AGL) <br /> <br />Figure 11: Mean cloud base <br />heights in meters above ground <br />Zeve l. <br /> <br />(1) An axis of low bases runs from southern Oklahoma northward along. <br />the western boundary of the High Plains, and (2) a parallel axis of <br />high bases runs northward from eastern Kansas. <br />One possible explanation for this distribution is the mean move- <br /> <br />ment of dome-shaped continental-polar air masseS through the High Plains. <br /> <br />In winter, these cold air masses make periodic wintertime invasions <br /> <br />southward into the central High Plains. They enter the United States <br />from the Great Plains of Canada and generally turn southeastward under <br />the influence of the sloping terrain and the prevailing westerlies. <br />The shallow cold domes are capped by temperature inversions, and the <br />base heights of clouds in tHese high pressure systems would be <br /> <br />17 <br />