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CWCB Wintertime Weather Mod Report
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CWCB Wintertime Weather Mod Report
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Last modified
7/30/2009 12:11:35 AM
Creation date
9/30/2006 9:03:59 PM
Metadata
Fields
Template:
Water Conservation
Project Type
General OWC
Applicant
Weather Modificaton
Project Name
Colorado Weather Modification Program
Title
CWCB Wintertime Weather Modification Report Fall 2002 - Spring 2003
Date
7/1/2003
Water Conservation - Doc Type
Final Report
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />the DWD Program. The second summary is for seeding operations for the benefit ofDWD utilizing the <br />VailfBeaver Creek generator network. The data format is the same as the DWD Operational Seeding Summary <br />format. <br /> <br />An analysis of the Seasons Precipitation Data was completed using the Snotel Precipitation Sites in the mountain <br />region of the Central Colorado Seeding Program Region. A Table of Results is included for the entire Seeding <br />Program in this region, which also indicates seeding increases in your Program region and adjacent areas. Data <br />provided in this table includes: <br /> <br />1) The normal precipitation amount for this period oftime (Nov. 1,2002 through Apr. 7,2003) <br />2) The actual precipitation observed for this period and its percentage of Normal. <br />3) The amount of precipitation that occurred during the seeding events as a percent of this seasons total. <br />4) The estimated amount of precipitation that would have occurred without a Seeding Program. <br />5) The estimated increase in precipitation as a percentage of the amount during the seeded period. <br />6) The estimated increase in precipitation as a percentage of the amount for the entire season. <br /> <br />The estimated increases in precipitation at each of the Snotel Sites in the region of the entire Central Colorado <br />Seeding Program Area was plotted on a map of the Snotel Sites in Northern Colorado. An analysis of the <br />estimated seeding results is included in included as a part of this report. An overlay of this data analysis on the <br />precipitation collection watersheds benefiting the DWD Program in the Program Areas should provide an estimate <br />of the total additional acre-feet ofsnowpack water available for runoff resulting from the cloud seeding efforts. <br /> <br />The procedure for estimating the seeding increases was bases on two research analysis conducted by Western <br />Weather Consultants, LLC of two separate seeding programs ** conducted over the Colorado mountains utilizing <br />similar seeding applications and weather event identification criteria. Both ofthese analyses produced extremely <br />similar evaluations of seeding responses to the systems being treated. A composite of these results utilizing a <br />conservative estimate of these seeding responses to the associated prevailing wind direction of the storm system <br />has been developed by Western Weather Consultants and forms the basis of this process to estimate seeding <br />increases. <br /> <br />Western Weather Consultants also followed the accumulation of the precipitation at the various Snotel Sites in the <br />Colorado Mountain Region throughout this winter's seeding season. We looked at how the precipitation was <br />accumulating as a percentage of what normally accumulates during the seeding season. Plots of the analysis of this <br />data are included for the periods ending March 1, 2003 and April 8, 2003 to show the trend of the winter's <br />precipitation accumulation and the impact of the large storm of mid-March, 2003. <br /> <br />** Precipitation increase estimates were made utilizing previous research results from the Colorado River Basin <br />Pilot Project (research randomized seeding program), June, 1976; and 10 and 16 Year Data Sets from two separate <br />precipitation sources for the VaillBeaver Creek Seeding Program (operational seeding program), March, 2001 <br />
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