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<br />.......--= <br /> <br />half of the STORMS possibly due to mesoscale disturbances. According to <br /> <br />modellirl~~~ies delivery of~~eding_. material _~o clouds over the Tushar <br /> <br />,.-~~ <br /> <br />Mtns from ground generators is Iim_it~d by dowl}slope. flow from the east, <br /> <br />entrapment of the seeding material in "dead" air near the surface, <br /> <br />northerly or southerly flow parallel to rather than toward the Tushar <br /> <br />Mtns, and the narrowness of the seeding plume. Even with a narrow plume <br />-~ -'-"",,"- ."""'.' -- .-.. . - ~...... <br /> <br />only 36% of the soundings considered showed seeding material was delivered <br /> <br />to the clouds. Delivery of seeding material from a high altitude genera- <br /> <br />tor was shown to be effective in one case. <br /> <br />Chemical analysis of the <br /> <br />snowpack show~9 little silver ,above background levels, and indium con- <br />" .." <br /> <br />centrations above background were less than expected naturally. This was <br /> <br />probably due to the small fraction of seeding material delivered, natural <br /> <br />compaction of the snow, and the 4 cm resolution of the snow sampling <br /> <br />technique. <br /> <br />\rincipal s;ondysions of the <br /> <br />.~,,~~~,...~-~.^~ <br /> <br />1983 field investigations and <br /> <br />analysis are that substantial amounts of superc.??led liquid water are pre- <br />....-..,..,.~--.. <br /> <br />----------"'":'>- .' <br /> <br />sent in the study clouds, primarily in their lower levels and over the <br />-.- ~ ---- --. -....,-.---- <br /> <br />Tushar Mtns, but that delivery of seeding material to the clouds from low- <br /> <br />altitude ground generators is _ frequently "limJ~ed by'.__~eteo~~I_ogical con- <br />'--- -".; ..... .. _._-- ...~ . <br /> <br />ditions. <br /> <br />iv <br />