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Last modified
7/28/2009 2:28:07 PM
Creation date
10/1/2006 2:14:19 PM
Metadata
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Template:
Weather Modification
Sponsor Name
Western Weather Consultants, LLC
Project Name
Cloud Seeding Analysis
Title
An Analysis of Regional Snotel and Ski Area Precipitation Data To Evaluate Precipitation Changes Resulting from Ten Seasons of Wintertime Cloud Seeding Operations over the Vail Ski Area
Prepared For
Vail/Beaver Creek Ski Areas
Prepared By
Western Weather Consultants, LLC
Date
3/1/2001
Weather Modification - Doc Type
Report
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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 />
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