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I I I I I I I I I I I I I I I I I I I V. ANALYSIS This section contains re suits of processing and analyzing many type s of data. The magnitude of the processed data is such that publishing all of it is impractical; instead, we include here and in Appendix D repre sentative ex- amples. The remainder is available at Steamboat Springs. In the following sub- sections, we discuss in detail the re sults of ana- lyzing each specific type of data, and then summarize their composite re sult in a short section which evaluates our progress to date. We will be discus sing periods of artificial nucleation. In the 1965- 66 season, there we re about 900 hours of detectable precipitation on the Park Range ridge; we seeded about 220 of these hours. The seeding operations are broken down into "analysis periods", and Table III shows the major features of each analysis period. Table IV gives more detailed information on the vertical wind structure s for the analysis pe riods, and Figure 23 the wind variation during the pe riods. CLIMATOLOGICAL DATA To the meteorologist or hydrologist, the winter season of 1965-l966 was not average; precipitation through May 1 was about 60% of normal as measured at Steamboat Springs and surrounding climatological stations, Figure s 24, 25, and Appendix D, It is important that this lack of normalcy in a long-term sense not be an ingredient of the evaluation techniques that we use- -and it is not. The operational snow season from 1 November 1965 through 1 May 1966 yielded the least total snowfall in Steamboat Springs for any similar sea- son during the past fifteen years. Steamboat Springs precipitation totalled only 8.09 inches, and snowfall amounted to 92.7 inches. The season was characterized by storms which dropped too far south over the Great Basin before turning eastward. Thus, heavier precipitation fell in the San Juan Range of southwestern Colorado, than on the Park Range, - 37.-