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.' . . . . . 002H1 The efforts that are of greatest interest in the Pacific-Southwest are those listed under (3) and (4). Specifically, these are the efforts to increase snowfall in the higher mountains of the Pacific Southwest, to increase rainfall within the mesoscale precipitation bands entering i;he West Coast, and to increase rainfall from convective clouds in the 1,1 Southwest. Experiments to decrease hail damage and modify hurricanes are of considerably less interest in the Pacific-Southwest, as is inadvertent weather modification. At present, water shortages in the Pacific-Southwest are not critical, but by all estimates they soon will be. For example, most reports indicate that the Colorado River Basin will experience critical water shortages within 25 years. Cloud seeding efforts will increase during these 25 years because of increasing demand on available water supplies. Experi- mental evidence already lags behind operational cloud seeding programs, and increased demand brought on by approaching shortages may widen this gap. More evidence is needed on both specific and general weather modi- fication efforts before public pressure, rather than scientific know- ledge, dictates weather modification programs. There are diverse opinions within the professional and scientific communities on weather modification in general as well as on specific weather modification efforts or programs. In the remainder of this pro- gress report, we use the phrase "atmospheric scientist involved in weather modification," or simply, "atmospheric scientists." These terms refer to university teacher/scientists who are devoting significant time and efforts in weather modification and attended the NSF Workshop on Weather Modification and Agriculture in Ft. Collins, Colorado, July, 1975. It has been suggested that in our final report, we include position statements 2