WMOD00196

• Contract/Permit #: 2003-01
• Sponsor Name: Gunnison County, City of Gunnison, Crested Butte
• Project Name: WM Evaluation Report
• Title: The Development, Conduct and Evaluation of a Cloud Seeding Program for the Gunnison River Basin, CO During the 2003-04 Season
• Date: 8/1/2004
• County: Gunnison
• State: CO
• Weather Modification - Doc Type: Reports

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

ACKNOWEDGMENTS

REFERENCES

Appendices

A Notice ofIntent of Modify Weather
B Historical Cloud Seeding Programs in Colorado
C Regression Equations for Gunnison 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

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

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

Fil!:ures

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) ....................................................._........ II
2.4 Wind rose for January (22 soundings) ..................._.................................._......... 12
2_5 Wind rose for February (29 soundings) .............................................._........._..... 13