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<br />27 <br /> <br />4.0 RESULTS <br /> <br />. <br /> <br />4.1 Trajectories <br /> <br />.. <br /> <br />Figures 11, 12 and 14 are the isentrope analyses for 1500 and 2100 <br /> <br />and are shown because they are representative of trajectories that are <br /> <br />produced by the analysis. The balloon ascent curves are the result of <br /> <br />the adjustment for balloon drift. The first three analysis times (1200, <br /> <br />1500 and 1800) show a smooth flow of air over the ridge. At 1200, all <br /> <br />Be tubes rise between Minturn and Camp Hale and as they go over the <br /> <br />ridge. The lowest air going over the barrier is at about 670 mb. over <br /> <br />Minturn. The 1500 analysis (Figure 11) shows all but the top two chan- <br /> <br />nels rising with the lowest air going over the ridge at 720 mb, over <br /> <br />Minturn. By 1800 some channels are descending between Minturn and Camp <br /> <br />Hale and only air below about 500 mb. rises as it traverses the ridge. <br /> <br />The lowest air getting to Fairplay is at 650 mb. at Minturn, At 1200 <br /> <br /> <br />the nature of the isentrope analysis is radically different. Isentropes <br /> <br /> <br />that go across the mountains beneath 475 mb. are horizontal as shown <br /> <br />in Figure 12. There are also isentropes that "circle back" forming a <br /> <br />volume of air with significantly unstable lapse rates of Se. Unstable <br /> <br />lapse rates along with a steady northwest wind imply a mixing layer be- <br /> <br />tween about 590 and 530 mb. The mixing layer is compatible with the <br /> <br />ground observations that the precipitation is convective in nature. <br /> <br />Also, the height of the layer agrees with radar observations made during <br /> <br />similar cloud cases for the area by Furman (1967). All the channels <br /> <br />going across th~ barrier are horizontal or descending. Since there is <br /> <br />precipitation, there must be upward vertical motions and, under the <br />