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002572 CONTRACTOR: State of North Dakota Weather Modification Board, Bismarck, North D akot a CONTRACT NO. 6-07-DR-20070 PRINCIPAL INVESTIGATORS: R. Lynn Rose and Howard L. Johnson PERIOD: March 1, 1976, to December 31, 1978 FUNDING: None The Bureau of Reclamation provided access to the Skywater Environ- mental Data Network for use by the North Dakota Weather Modification Board during its 1977 Cloud Modification Project. The network data collection and analysis capabilities were used routinely by field meteorologists, who directed the actual seeding operations. Upper air observations made by the Board were used as input to the Skywater Great Plains Cumulus Model, and the Board evaluated the model's performance as an independent predictor of convective activity in the North Dakota project area. The model was a valuable forecast tool when used with other products available to the forecaster. It provided information about stability and potential cloud growth which was not obtainable from analysis of a thermodynamic di agram. , I L ~ i CONTRACTOR: Aeromet, Inc., Norman, Oklahoma CONTRACT NO. 6-07-DR-200BO PRINCIPAL INVESTIGATOR: D. Ray Booker PERIOD: May 1,1976, to September 15, 1976 FUNDING: FY76 - $ 5,500 T.Q. - $14,275 Aeromet, Inc., furnished a cloud survey and cloudbase observation research aircraft for HIPLEX at the Goodland, Kansas site from May 12 through August 15, 1976. , On all days when significant convective clouds were forecast, the aircraft was flown to obtain measurements of moisture and temperature fields and to make updraft profiles on cumulus clouds. Aeromet also performed soundings to complement rawinsonde observations taken at Goodland. These data became part of the HIPLEX data base and were used as an analysis tool by Environmental Research and Technology, the con- tractor directing operations at the Goodland site. II 1-25