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I I I I I I I I I I I I I I I I I I I IV. DATA The type and time duration of data collected in Phase II-Part A are summarized in Figure 21. The following paragraphs de sc ribe each type of data and pre sent illustrative example s. Where practical, Appendix D lists original data in tabular form; the snow- rate data are too numerous for such listing s but are available in punch card form. PARTICLE DETECTION Twenty-four diffusion tests were conducted in the Steamboat Springs area between 1 November 1965 and 1 May 1966 to determine diffusion char- acteristics of a plume from Emerald Mountain under various wind and stabi- lity conditions. The data were collected in real-time by the aircraft. Approximately 200 snowmelt samples, most of them from the target area, have been collected and processed by the laboratory's zinc sulfide ana- lyzer. About 100 snowmelt samples have been analyzed by the neutron acti- vation technique under a subcontract with Battelle-Northwest Laboratories. Natural nuclei data from the Valley View Lodge location were taken throughout the winter and spring, twice a day, and in greater time detail on special occasions, PRECIPIT ATION DAT A The 15 precipitation-rate sensors in the network were in operation throughout the precipitation season, 1 November 1965 through 1 May 1966. During this time they tracked approximately 50 storm sequences through the area; about half of these were artificially nucleated. Not all stations track- ed all storms; Figure 22 lists each station and depicts the storms that the station tracked successfully. There were approximately 220 hours of seed- ing operatings during the season and these, too, are indicated in Figure 22. The network was converted to rain- rate sensing on 1 June 1966. This network will be the primary data source through 1 October 1966 when, in - 31 -