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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br /> <br />wintertime cloud seeding program. Progress toward these objectives also <br /> <br />will increase basic knowledge of wintertime clouds ~n mountainous <br /> <br />regions. Findings related to these objectives are as follows. <br /> <br />Seeding m~lterial <br /> <br />transport and delivery. <br /> <br />The experiments <br /> <br />involving release and sampling of sulfur hexafluoride involved the use <br /> <br />of new equipment and thus were preliminary in some ways. Nevertheless, <br /> <br />they led to the important conclusion that: the wind structure may change <br /> <br />during a STORM and affect the transport of seeding material to the <br /> <br />clouds. <br /> <br />During parts of a STORM the airflow at low altitudes over the <br /> <br />Beaver valley may be southwesterly or westerly with a component toward <br /> <br />the Tushar Mtns. <br /> <br />Delivery of ground-released seeding material toward <br /> <br />the mountain;s/ma,f'~en occur. <br />I","""" <br /> <br />At other times in a STORM the airflow may <br /> <br />be northerly and parallel to the mountains. <br /> <br />Delivery of seeding <br /> <br />material may be prevented at these times. <br /> <br />Previous studies of seeding <br /> <br />material transport have shown the importance of inversions in trapping <br /> <br />ground-released material at low altitudes in valleys. <br /> <br />It is now known <br /> <br />that the evolving winds ~n a STORM can affect transport. <br /> <br />It ~s <br /> <br />concluded that both inversions and winds must be considered ~n deciding <br /> <br />when and how to seed winter clouds ~n mountainous regions. <br /> <br />The 1985 field research period overall appeared to be colder and <br /> <br />drier than normal. This was due to the predominance of a ridge of high <br /> <br />pressure over the western United States. <br /> <br />Despite this abnormality, <br /> <br />eighteen STORMS were observed. <br /> <br />Rather complete sets of data were <br /> <br />collected on the supercooled liquid water in and precipitation from <br /> <br />these STORMS. <br /> <br />Supercooled liquid water. <br /> <br />The t;:adiometer observations were the <br />--"-,,,,,~,",,_.~.-,".,'"''~',._"''.''''' <br /> <br />most complete. They showed that maxima in the supercooled liquid water <br /> <br />-xxii i- <br />