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. Techniques to es and rain gages are than 300 km2) cann use radar; whereas within 25 percent imate rainfall from convective complexes using radar continuing. Rainfall from small storms (area less t be reasonably estimated from rain gages and must larger storms area> 1000 km2 may be estimated to rom gages alone. - . Coordinates of r dar boxes for twelve 1979 HIPLEX-1 cases were defined for their radar re ponse variable analyses; all response variables from aircraft and radar were then compiled for these cases. Studies for the evolv ng design and evaluation of HIPLEX are continuing under this contract. CONTRACTOR: Colorado International Corporation, Boulder, Colorado CONTRACT NO. 7-07-83- 0004 PRINCIPAL INVESTIGATO: Dennis Treddenick CONTRACT PERIOD: March 11, 1977, to February 15, 1979 FY79 FUNDING: $295,808 PURPOSE: Provision 0 cloud seeding and survey research aircraft The contract objective is to develop an effective technology for seeding showery, warm-season cumulus clouds. To achieve this objective, the contractor provides a cloud seedi g and survey research aircraft, performs cloud seeding flights and related ac ivities, and performs reliable and rapid data collec- tion and archival. CI furnishes an instrumented Learjet, a high-performance aircraft which provide for timely delivery of dry ice seeding material to test clouds using the 'on top" del ivery technique. In 1979, the CIC Learj t made 6 flights for testing, 2 calibration flights, and 18 research missio flights. A total of 30 experimental events were flown, 21 of which wer active seed events. All cloud physics data were archived on 9-track ma netic tapes and are being processed together with other Montana HIPLEX d ta sets. An intensive case study of convective complex development ob erved at the Goodland, Kansas HIPLEX site on May 23, 1978, is nearly comple e. This analysis uses new three-dimensional display techniques to show the complex time/space relationships between multiple aircraft observations, radar, and rawinsonde observations. CONTRACTOR: National Boulder CONTRACT NO. 8-07-83-V PRINCIPAL INVESTIGATOR PERIOD: December 1, 1 FY79 FUNDING: $66,000 PURPOSE: Perform rese Est imat ion Imagery" ceanic and Atmospheric Administration, Colorado 016 (Memorandum of Understanding) William Woodley and Cecilia G. Griffith 77, to September 30, 1979 rch in connection with proposal for "Convective Rain in the U.S. High Plains Using Geosynchronous Satellite The contract goal is t develop a technique to estimate rainfall over the High Plains using digi al, geosynchronous, visible, and infrared satellite imagery. This techniq e will be used to estimate rainfall at the three 17