WMOD00266

• Sponsor Name: NAWC
• Project Name: Gunnison Cloud Seeding Annual Report 2004
• Title: The Development, Conduct and Evaluation of a Cloud Seeding Program for the Gunnison River Basin, Colorado During the Winter of 2003-2004 Winter Season
• Prepared For: City and County of Gunnison
• Prepared By: Don A. Griffith, David P. Yorty, Mark E. Solak
• Date: 8/1/2004
• Weather Modification - Doc Type: Report

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TABLE OF CONTENTS (continued)

Appendices

A Notice of Intent of Modify Weather
B Historical Cloud Seeding Programs in Colorado

Tables

2-1 NA WC winter cloud seeding criteria ................................................................... 3
2- 2 Cloud seeding generator locations ........ ............................................................... 6

3-1 Storm dates and generator usage, 2003-2004 water year ..................................... 13
3-2a Generator hours for Gunnison County target area, storms 1-10 ........................... 14
3-2b Generator hours for Gunnison County target area, storms 11-20 ......................... 15

4-1 Precipitation control sites .................................................................................... 38
4-2 Precipitation target sites...................................................................................... 38
4-3 Snow water equivalent control sites .................................................................... 46
4-4 Snow water equivalent target sites ...................................................................... 47

Fit!u res

2.1 Seeding target area and generator locations ......................................................... 5
2.2 Photo of a CNG in operation.. ............... .... ................................... ........... ............ 7
2.3 V isible satellite image .......................... ............................................................... 8
2.4 Upper-air sounding............................. ............................................................ ..... 9
2.5 Weather radar image..................... ........ ............................................................... 10

3.1 NRCS SNOTEL plot for Park Cone, CO ............................................................ 17
3.2 NRCS SNOTEL plot for Porphyry Creek, CO.................................................... 18
3.3 NRCS SNOTEL plot for Slumgullion, CO ......................................................... 19
3.4 Maximum and minimum daily temperatures and normals at Butte, CO ............ 25
3.5 Precipitation and normal values at Butte, CO ..................................................... 25

4.1 Map of2002-2003 cloud seeding operations in Colorado (CWCB) ................... 32
4.2 ActuallPredicted downwind ratios from Utah study............................................ 33
4.3 Double-Mass plot comparing Bluff and Cedar Point, UT .................................... 35
4.4 Precipitation target and control sites .................................................................... 37
4.5 Snowpack target and control sites ........................................................................ 46
4.6 Porphyry Creek SNOTEL graph for April 1-16, 2004 ......................................... 48
4.7 November precipitation......................... ............... ..................................... ........... 49
4.8 December precipitation....... ....... ........................................................................... 50
4.9 January precipitation.................. ........................................................................... 51
4.10 February precipitation........................................................................................... 52