CWCB Wintertime Weather Mod Report

• 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

Appendices

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6.0 SUMMARY AND RECOMMENDATIONS .................................................... 73

ACKNOWEDGMENTS

REFERENCES

A Notice of Intent of Modify Weather
B Historical Cloud Seeding Programs in Colorado
C Regression Equations for Gurmison County Target/Control Evaluations

Tables

2-1 Average monthly precipitation ............................................................................. 3
2-2 Average cumulative snow water content .................,.........,.................................. 3
2-3 Storm statistics partitioned by month ............................................................,...... 6
2-4 Storm statistics by 700-mb wind direction sector .......,.........................,.............. 7
2-5 NA WC generalized winter seeding criteria ..,...,..........................................,...... 24

6-1 Summary of events related to the development ofa winter cloud seeding
Program for Gunnison County, Colorado .......................................................... 74

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3-1 Cloud seeding generator locations ...................................................................... 33

4-1 Storm dates and number of generators used, 2002-2003 water year ,................. 34
4~2a Generator hours for Gunnison County target area, storms 1-8 ........................... 35
4-2b Generator hours for Gunnison County target area, storms 9-14...,..................... 36

5-1 Precipitation control sites .............,....,................................................'......,........ 54
5-2 Precipitation target sites ,..........................,......................................................... 54
5-3 Snow water equivalent control sites ...............................................,................... 61
5-4 Snow water equivalent target sites ..................................................................... 61
5-5 February and March 2003 precipitation, snow water, and percent of normal
Values for Gunnison County SNOTEL sites ..................................................... 66

Figures

2.1 Wind rose for October (18 soundings) ................................................................. 9
2.2 Wind rose for November (24 soundings) ............................................................ 10
2.3 Wind rose for December (9 soundings) .............................................................. Il
2.4 Wind rose for January (22 soundings) ,............................................................... 12
2.5 Wind rose for February (29 soundings) .............................................................. 13