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<br /> <br />I <br />! I <br />I <br />I <br />I <br />I <br /> <br /> <br />", --. <br /> <br />37 <br /> <br />Convective Genesis Sites on the High Plains <br /> <br />Convective genesis sites over the 'plains are not as numerous and <br /> <br />appear to be associated with mesoscale features which act to enhance <br /> <br />low level convergence. Such features assumed the following forms: <br /> <br />1. ShallOl~ frontal surfaces which stagnated on the High Plains. <br /> <br />2, Meso bubble high pressure cells which are created by rain and <br /> <br />evaporationally cooled air associated with the previous day's <br />.. <br /> <br />convective downdrafts. <br /> <br />3. Dry line discontinuities between dry continental air masses <br /> <br />and moist maritime air masses. <br /> <br />The number of convective systems initiated over each of these <br /> <br />features is summarized in Table 6. The importance of dry lines is <br /> <br />readily supported by this study as a prime location of convective <br /> <br />ii <br /> <br />cell genesis. Previous studies by Rhea (1966), Miller (1967)' and <br /> <br />Schaefer (1973) stressed similar relationships in Texas, New Mexico <br /> <br />:i: <br /> <br />and Oklahoma. <br /> <br />Table 6. Number of Convective Systems Generated by Plains Genesis <br />Sites <br /> <br />, <br />i' <br /> <br />PLAINS CONVECTIVE <br />HOT SPOT <br /> <br />N UMBER OF CONVECTIVE SYSTEMS <br />(1970-71). INITIATED <br /> <br />::'! <br /> <br />1'," <br />,I <br />, , <br />L <br />'I'" <br />!r" <br />'",I <br />I, <br />,i' <br />I ' <br />" <br />H'. <br />H, ' <br />F'j <br />j':': , <br /> <br />,I, <br /> <br />MESO-BUBBLE HIGHS <br />DRY-LINES <br />CONVECTIVE SYSTEMS <br />SHALLOW FRONT <br />OTHER <br /> <br />12 <br />31 <br />30 <br />18 <br />8 <br /> <br />i'[i, ' <br />,1.,..1 <br />· ,fi',:! <br />,t"I!',.' "' j <br />,..., <br />~ ~; <br />