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<br /> <br />"'"' <br /> <br />L <br /> <br />. <br /> <br />,. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />1. Introduction <br />Winter orographic clouds have been identified for some time (Grant <br />and Kahan, 1974) as likely candidates for snowfall augmentation through <br />cloud seeding. The State of Utah operational snowfall augmentation pro- <br />ject presents an opportunity for gathering research information for <br />improving future such projects. In response to this opportunity and in <br />agreement with recommendations of the Weather Modification Advisory <br />Board (1978), the National Oceanic and Atmospheric Administration (NOAA) <br />initiated a cooperative. pro9ram of weather modification research <br />involving itself, the State of Utah, and local governmental bodies. <br />Experimental field research under this cooperative program has been con- <br />ducted in the Tushar Mtns area near Beaver, Utah in recent years as an <br />adjunct to the State of Utah operational project (see the reports by <br />Hill (1982) and Long (1984)). <br />In 1985 a field research program and subsequent data interpretation <br />and analysis will again be conducted by the Utah Division of Water <br />Resources (UDWR) and associated groups. The field studies will again be <br />in the Tushar Mtns area during the period 15 January to 15 March. <br />Details of the field program clppear in the 1985 Field Operations Plan. <br />The major objectives of the research remain essentially the same as in <br />earlier years and are to: <br />1) assess the transport and delivery of seeding material from <br />ground-based generators to the clouds over the Tushar Mtns, and <br />2) describe the spatial and temporal distribution of supercooled <br />liquid water in the douds, the physical processes responsible <br />for precipitation development, and the trajectories of cloud <br />and precipitation particles. <br />