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Evaluation of the Utah Operational Weather Modification Program
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hill, Geoffrey E. |
| Copyright Year | 1982 |
| Abstract | This study is an evaluat ion of a winter orographic cloud seeding project in Utah. The evaluat ion is based upon both intens ive field measurements and historic~l records. For the field measurements, ground and airborne data were collected during February and March, 1981 in the vicinity of the Tushar Mountains. In evaluating the physical data three aspects are emphasized: the dispersal of artificial ice nuclei, the distribution of supercooled liquid water, and the growth and trajectories of precipitation. Ground based measurements were made by K and X band radars, a dual frequency microwave radiometer, a network of precipitation gages, an ice nucleus counter,. radiosonde/clouds lde instrume nts and other standard measurements. Airborne data were obtained from the University of Washington t s • cloud physics aircraft. Instrumentation consisted of five ice particle probes (PMS), a Johnson-Williams and a Rosemount liquid water meter, an ice nucleus counter, and other devices for reference such as altitude, airspeed and position. Results derived from these data indicate that ice nuclei released from ground based generators did not generally reach cloud alt itudes in sufficient quantity for effective nucleation and that the area covered by the weak upper edges of the plumes was limited to the order of about 10% of the barrier. Supercooled liquid water was found to reach a maximum typically just upwind of the barrier crest. Amounts found during the research period were generally below that associated with seeding opportunities, but meteorological conditions at the time were unfavorable for the development of greater liquid water concentrations. Relationships of liquid water to other meteorological conditions are also investigated. |
| Starting Page | 1 |
| Ending Page | 1 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1419&context=water_rep |
| Alternate Webpage(s) | https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1419&context=water_rep&httpsredir=1&referer= |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
