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e e portion so logistics would be more difficult. However, the entire Mesa is accessible by snowmobile. The U.S. Forest Service administers almost all the high elevation land on the Mesa. 3. Uncompahgre Plateau The main disadvantage of the Plateau is its narrow along-the-wind extent_ for elevations above 9000 ft. It does not have winter road access to the top but a large system of logging roads and trails would provide very good snowmobile access. In other respects, the Plateau offers a good experimental area. 4. Boulder Mountain The BoUlder Mountain area does not have road access to the top and only fair snowmobile access. It is far removed from adequate airports and towns. While it appears possible to conduct experimentation at this location, logistics would be significantly more difficult and costly than at the other areas where low-level aircraft sampling is practical. 5. Wasatcli Plateau The Wasatch Plateau has been used for weather modification experimentation during early 1990 and 1991. As was the case for the Grand Mesa, the Plateau proved to be an excellent experimental site. The all-weather road network not only reaches the top but crosses the Plateau by two different highways, one of which parallels the upwind edge for several miles. Snowmobile travel is very good on top the Plateau. Perhaps the major problem is the difficulty of fmding good precipitation gauge sites. Much of the Plateau is bare of trees and most of the forested regions are covered with Aspen which offer little protection from the wind. A more careful examination of potential precipitation gauge sites is in order. 6. Chuska Mountains- The Chuska Mountains are located within the Navajo Indian Reservation. Tribal leaders have indicated interest in a weather modification program, Of course~ any experimentation would be subject to the will of the tribe. The Chuska Mountains are crossed by an all-weather highway, and snowmobile access should be good as the high terrain is not very rugged. A potentially serious drawback is the narro,\! along-the-wind extent of elevations above 9000 ft, even narrower than the Uncompahgre Plateau. However, a broad, gradual uplift zone exists upwind of the Mountains. The location is far south of other potential sites, raising questions of transferability of results. The frequency of suitable storms for either ground-based or aerial seeding is likely significantly less than at the sites in central Colorado and central Utah. 7. Summary The two best potential experimental sites appear to be the Grand Mesa of Colorado and the Wasatch Plateau of Utah. The Grand Mesa is atypical in that it has an east-west major axis. However, it can be argUed that because of proximity, Mesa cloud and 12