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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 />should be sought. <br /> <br />The explanation may lie in a consideration of which <br /> <br />precipitation particle trajectories intersect on average the bulk of the <br /> <br />supercooled liquid water ~n the clouds. <br /> <br />The case study of STORM 9 which occurred on 8-9 February represents <br /> <br />~--,-.-._-,,..-_....~...=...",,...~.~ <br /> <br />a major effort to understand the evolutiop and inner workings of winter <br /> <br />~,"~.~.--_.....,.,~..",,,,,,,,._.-,........-..~. <br /> <br />storms interacting with terrain in mountainous reg~ons. The variety of <br /> <br />~","__~....__.....~"..."",Jc'""_ <br /> <br />remote sensing instrumentation and other observational systems used have <br /> <br />permitted a rather comprehensive and detailed description of the STORM. <br /> <br />The description that is developed is reasonably complete yet more work <br /> <br />needs to be done in order to answer some of the questions raised by the <br /> <br />analysis made so far. Also, case studies should be made of other STORMS <br /> <br />in 1985 in order to understand a wider range of situations where snow <br /> <br />augmentation may be undertaken. <br /> <br />It is not useful to summarize all aspects of the case study of <br /> <br />STORM 9. Nevertheless, some key results and conclusions can be stated. <br /> <br />Winter storms in mountainous regions are variable rather than <br /> <br />~~_dY:s.t.~t.e during their lifetimes. <br /> <br />The changing synoptic meteoro- <br /> <br />logical fie lds affect the local atmospheric structure including the <br /> <br />stability of thl:~ atmosphere, the moisture distributions, and the wind <br /> <br />velocities. <br /> <br />Changes in these will affect how orography influences the <br /> <br />STORM on the local scale. Of particular importance in the present study <br /> <br />was how the wind velocity (especially wind direction), in combination <br /> <br />with the terrain, influenced the rate of water release in updrafts and <br /> <br />the altitude and temperature of the water released. There was in turn <br /> <br />an effect on the supercooled liquid water in the STORM clouds. <br /> <br />In <br /> <br />particular, it was found that when there was strong. flow at low- <br /> <br />-xxv- <br /> <br />j <br />