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<br />The rea~on~ for these results are elplorcd. b:llsed on evidence from prior <br />c'perimental projects. since detailed ph)'sical obsen'atioDs lHl"e well beyond the scope of <br />the nws operational project. II seem!> probable that frequenl !>urfa('e~based inversions <br />trapped ^~I released al relatively loW" ele"'alioos. An additional problem may be that the <br />Agl generator spacing, ",,'ith ~'pic.al distances in the 5 to to mile range, ma)o have resulted <br />in gaps betwccn seeding plumes when the,.' \Hl"e transported OH~r the mountains. It is also <br />possible that the Agl output rates were too limited. <br /> <br />It is r<<ommended that limited-scale plume transport and dispersion inHostigstions <br />precede any future anempts at lar"2e-scalc cloud seedin~ in central Colorado. The shiHl)' to <br />roulind)" seed intended cloud r~ions wilh adequate ice nuclei concentrations OHr large <br />\'olumes should be demonstrated before an~ further large-scale operational seeding efforts. <br />Onl)" then can it be assumed Ihat the intended clouds are actuall~' being seeded on .. r~ular <br />basis. To quote a 36 ~'ear old scientific article (Smith and Heffernan 1967), " - persons <br />who release silnr iodide from the ground would be wise to find out where it goes." <br /> <br />-' <br />