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<br />water measurements to be associated with regions of storms where shallow cl~uds <br />were present, a feature observed during SCPP. <br /> <br />A.number of case studies have also been analyzed fromi,nvestig-ations in the. <br />Tushar mountain region of southern Utah. Sasson et ~l. (1986) documented the <br />passage of a weak cold front over the Tushars. They found supercooled water to <br />be present throughout the storm except during the cold frontal passage. The <br />maximum values of supercooled water occurred in the post-frontal convective <br />region of the storm, consistent with our measurements of weak cold frontal <br />passages in the Sierra Nevada. Rauber and Grant (1987) documented the evolution <br />of supercooled water during an orographic storm associated with a weak cold <br />front. They also found supercooled water to be present continuously within this <br />storm although the orographic clouds, in this case, were pre-frontal. The <br />Tushar storm discussed by Long (1986) was particularly interesting because the <br />same storm affected the SCPP area the day before (7-8 February 1985), and was <br />well documented by both projects (see Reynolds and Kuciauskas, 1987). The storm <br />discussed by Long had supercooled water evolution similar to that observed in <br />SCpp. in the early pre-frontal region, but differed substantiany in the post- . <br />frontal region. In California, the passage of the cold front resulted in a <br />reduction in cloud depth and a large increase in supercooled water over the <br />crestline. In Utah, the cold frontal passage was accompanied by a reduction in <br />supercooled water. The' difference appeared related to prevailing wind direction <br />in the post-frontal region in the two areas. Over the SCPP area, winds remained <br />westerly (barrier perpendicular) in the post-frontal region, while in Utah the <br />winds became northerlx (barrier parallel), eliminating orographic lift. <br /> <br />Radiometric measurements of supercooled water have also been reported from a <br />three-year study over Colorado's Gr'and Mesa by Super et al. (1986). These <br /> <br />31 <br />