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<br /><':J " <br /> <br />.j' <br /> <br />Ii <br /> <br />. <br /> <br />'. <br /> <br />1.2 <br /> <br />carried on year-round for 22 years, and has resulted in a unique <br />collection of weather data for research in synoptic climatology, The <br />FAA and NWS maps and photographs also support ORIls involvement in <br />case studies of storms of importance to SCPP, <br /> <br />(2) Weather forecasts and nowcasts: Weather forecasts and now- <br />casts relevant to the Central Sierra Nevada are conveyed to colleagues <br />concerned with the radar field studies and snow sampling logistics, <br />and are used in the coordination of ORI research and operational ac- <br />tivities with those of other members of SCpp, This information enables <br />the ORI participants in SCPP to understand the rationale for plans <br />discussed in conference calls, and it provides a basis for other deci- <br />sions affecting both the operation of ORI cloud seeding generators and <br />the suspension of such operations, Of special concern this season <br />will be the coordination of ORI operational seeding activities in the <br />Truckee and Carson watersheds with the cloud seeding experiments <br />planned by SCPP using ORI, SMUD and PG&E ground-based AgI generators. <br /> <br />B. Mesoscale Measurements and Observations: <br /> <br />This task focuses on an area of over 1,000 square miles compris- <br />ing the east slope of the Central Sierra Nevada, the Carson Range and <br />the watershed of Lake Tahoe and the Truckee River (see map), Within <br />the area are approximately 40 sites where rain and snowfall are mea- <br />sured, two mountain summit weather stations which provide real-time <br />data, and several special study areas where the effects of weather <br />and climate on terrain, vegetation, wildlife, water resources and <br />human activities have been studied continuously for over 20 years, <br />The major parts of this task are discussed briefly below. <br /> <br />(1) Mesoscale precipitation network. After each storm, rain <br />and snowfall are measured at about 40 sites in the Lake Tahoe water- <br />shed, At about 15 of these sites heated tipping-bucket snow gauges <br />