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Last modified
7/28/2009 2:42:30 PM
Creation date
4/30/2008 2:48:03 PM
Metadata
Fields
Template:
Weather Modification
Contract/Permit #
NOAA/NA-81-RAC-00023
Title
Evaluation of the Utah Operational Weather Modification Program - Final Report
Date
4/1/1982
State
UT
Weather Modification - Doc Type
Report
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<br />2.0 ANALYSIS AND EVALUATION OF PHYSICAL PROCESSES <br /> <br />(TESTS OF HYPOTHESES) <br /> <br />T-r this sect ion the three prImary hypotheses being evaluated <br />In this study will be tested. The primary hypotheses relating to the <br />operational project are 1) that Ice nuclei dispersed from ground based <br />generators reach clouds In sufficient quantity at suitable locations so <br />that precipitation is artificially enhanced, 2) that supercooled liquid <br />water is present In sufficient quant ity from time to time so that a <br />useful precipitation augmentation potential by cloud seeding exists, and <br />3) that precipitation growth and trajectories are affected by artificial <br />seed ing. <br /> <br />The tests of hypothesei are based upon data collected over a <br />two month period February 1 through March 31, 1981 in the general <br />vicinity of the Tushar }fountains in Southern Utah. A discussion of <br />the details of the data collected and methods employed is made In <br />Appendix A. <br /> <br />2.1 ICE NUCLEI DISPERSAL <br /> <br />2.1.1 Seeding operations. The North American Weather Consultants' <br />(NA~C) seeding-generator network of 1980-81 consisted of some 59 gener- <br />ators in the primary Wasatch target area and another 14 in Tooele County <br />and southeastern Utah. This network is shown in Fig. 2. The Tushar <br />Mountains are located in Block 17 near the center of the prImary target <br />area. A smaller scale map including seeding generators affecting the <br />Tushar's is shown In Fig. 3. <br /> <br />The criteria used in the 1980-81 season for seeding decisions <br />are, according to NAWC (1981), as follows: <br /> <br />1) Gloud top temperatures colder than -lOoe and warmer than <br />-30oC <br /> <br />2) Saturation cloud base mIXIng ratios of 3 g Kg-lor more <br /> <br />11 <br />
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