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<br />either case, the estimated precipitation increases attributed to a <br />seeding effect can be reduced by a proportionate amount. <br />Mathematically this would reduce the seeding effect increase in the Vail <br />Area precipitation to 15% and the total period seeding effect increase <br />to 7%. <br /> <br /> <br />. The breakdown of the seeding effects on precipitation by wind <br />direction categories indicates that the most favorable wind direction for <br />the largest increases occur with wind directions from the West through <br />North. <br /> <br />. The six year comparative evaluation indicated similar over all results, <br />but of smaller percent changes. This could indicate the cumulative <br />nature of the increased precipitation from seeding (longer seasons <br />usually result in more observed precipitation therefore more <br />opportunities for increased precipitation) and/or the more favorable <br />effects of seeding during periods of wetter weather events, or both. <br /> <br />. The influence of Up-wind Mountain ranges on the distribution of <br />precipitation versus elevation on down-wind mountain ranges is <br />included for general information. <br /> <br />Results of Ski Area Observations <br /> <br />. ~ <br />. An evaluation of most (aprox. 82%) of the seeded days of precipitation <br />over the Vail and region ski areas indicates an average increase of <br />31% in the observed precipitation at Vail compared to what was likely <br />to have occurred. <br /> <br />. The breakdown of the seeding effect on precipitation by wind direction <br />categories indicates that the most favorable wind directions for the <br />largest seeding effect occurs with wind directions from West through <br />North (similar to Snotel evaluation). <br /> <br />· The pattern of changes from seeding effects on precipitation amounts <br />by wind direction categories and for the total data set is both smoother <br />and has consistently larger precipitation changes in the Ski Area <br />evaluation as compared to the Snotel evaluation. This could be a result <br />of the precipitation data collected by the ski areas being measured to a <br />greater accuracy. <br />