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CONTRACTOR: State of Texas, Department of Water Resources, Austin, Texas CONTRACT NO. 14-06-D- 587 (Cooperative Agreement) PRINCIPAL INVESTIGATO S: Herbert Grubb and John Carr CONTRACT PERIOD: Oct ber 30, 1975, to December 31, 1980 FY79 FUNDING: $690,0 0 PURPOSE: Cooperative weather mod"ification research in the Texas Hi~h Plains Through this agreement, the TDWR and Water and Power are cooperating to further HIPLEX research in the southern High Plains. The TDWR coordinates research activities an is responsible for administrative functions. Other responsibilities inclu e forecast support services, study of possible eco- nomic effects, and for ulating a forecasting technique for summertime rain- shower development. S'x subcontractors cooperating in the project are: Big Spring Aircraft, Inc., CIC, Colorado River Municipal Water District, MRI, Texas A&M University, nd Texas Tech University. The primary goal of th Texas HIPLEX program is to advance our understanding of the mesoscale (25 t 100 km) dynamic and thermodynamic controls of convec- tive precipitation mec anisms in the southern High Plains. Research efforts are directed toward me ging the larger scale wind fields, temperature and moisture fields observ d from 7 rawinsonde systems and 25 automatic surface observation systems wi h data collected from cloud physics aircraft, digital radars, and satellites to describe the phYSical mechanisms which produce rainfall. Rainfall is observed by 106 recording rain gages in the vicinity of the Texas HIPLEX fi ld site at Big Spring. During the past 4 years, digitized rainfall dat have been tabulated from this network for the period from April to Septembe . Ongoing analyses are p oviding many useful results which help to understand mesoscale controls of onvective rainfall and internal cloud processes which produce raindrops. Me oscale moisture convergence and vertical lifting have been shown to be signi icant large-scale factors in convective rainfall. Ice phase processes ha e also been identified as important internal cloud mechanisms which produ e significant rainfall. Clouds sampled in 1979 when ice was observed had h avier precipitation with longer duration and greater spatial extent than that from clouds without ice. Analysis of phYSical mechanisms that produce internal cloud structures and mesoscale controls which may initiate clou formation is continuing. ;. CONTRACTOR: State of K nsas, Water' Resources Board, Topeka, Kansas CONTRACT NO. 14-06-D-7 42 (Cooperative Agreement) PRINCIPAL INVESTIGATOR: Not applicable CONTRACT PERIOD: Febru ry 1, 1975, to December 31, 1980 FY79 FUNDING: $30,000 PURPOSE: Cooperative w ather modification research in the High Plains This cooperative agreem nt is complementary to Contract No. 14-06-0-7544. The State of Kansas and the Water and Power Resources Service are jointly funding and supporting tudies on the effects of cloud seeding, particularly 9