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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />is yet to be analyzed. One snow sample collected at the target near the end of the seeding experiment <br />showed a slightly enhanced silver concentration. The 2D data for a period encompassing this snow <br />sample might offer additional evidence of a seeding effect. <br />The SF:, and ice nuclei measurements delineated the seeding plumes on a portion of the <br />plateau. but the lack of plume evidence on the do\Vn\vind side of the plateau revealed the complexity <br />of airflow O\'er mountainous terrain, and points to the need for modeling or additional measurements <br />to completely document, or predict, plume trajectories. <br /> <br />B. 7 February 1994 Case Study <br />This case was studied primarily to document differences in supercooled liquid water depths <br />measured by the DR! mobile radiometer and the stationar)' USBR radiometer. It represents the best <br />case from 1994 when the mobile radiometer measured cloud liquid over a major cross-section of <br />the Wasatch Plateau, and collected data for a significant time period at the TAR site near the <br />dO\\TI\\'ind edge of the plateau. <br /> <br />1. Additional ~Ieteorological Data <br />The 7 February weather situation was described in Sec. I1IB, Figs. 9-11. The period of <br />interest here was intluenced by slightly anticyclonic southwesterly flow ahead of a major trough that <br />\vas beginning to move into southern California. Figure 11 revealed the research area was covered <br />by relatively warm-topped clouds to the north of an extensive shield of altostratus and cirrus. <br />Soundings from!vIt. Pleasant, at 0800 and 1200 (Figs. 46 and 47), showed a water-saturated layer <br />extended from just below plateau top to 5600 m at 0800 and to 4600 at 1300 m. The earlier <br />sounding \'vas stable, while the latter sounding showed stable conditions below cloud and some <br />convective instability in the moist layer. The winds at 0800 veered consistently from a southerly <br />direction near the surface to about 2600 at 4600 m. Wind speed increased from 4 m S.l ne3r the <br />valley floor to 18 m S.l at plateau top, then remained nearly constant in speed through the moist <br />layer. Sounding temperatures indicated the plat~au top was at about -50 and the top of the moist <br />laver \vas at about -22". <br /> <br />Conditions on top of the Wasatch Plateau during the experimental period on 7 February <br /> <br />62 <br />