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.. 2 . OBJECTIVES 2.1 HIPLEX Program The goals and objectives of the overall HIPLEX Program remain un- changed from those presented by the Illinois State Water Survey in the final report on the HIPLEX Design Project, dated June 30, 1976. 'l~he report lists three specific objectives which are: (a) To increase the scientific understanding of the natural cloud and precipitation processes in semi..isolated convective entities in the high plains, and of the alterations in cloud structure and resultcmt precipitation that occur when these processes are manipulated in a pre- scribed manner; (b) To establish the level of certainty with which these manipu- lations will result in the predicted alterations through a randomized proof of concept experiment (POCE) in semi-isolated simple cloud systems, with physical and statistical evaluation; and (c) To develop the physical and socio-economic baseline infonnation needed for establishing the need fOl: an area-wide experiment and for designing such an experiment. The 1978 Texas HIPLEX field progra.m is designed to make a contri- bution to the overall goal and objectives of the overall HIPLEX program. The primary contribution of the field program will be directed primarily toward objective a above with lesser contributions to objectives b and c. 2.2 Texas HIPLEX Field Program for 1978 The objectives of the 1978 Texas HIPLEX field program are: (1) To collect data which can be used as the bases for a compara- tive evaluation of the capabilities of the Navajo and Lear Jet for on-top seeding of towering cumulus and emerging turrets of convective complexesj (2) To collect radar, satellite, rainfall, and airborne cloud physics data to be used with the mesoscale data in order to establish a detailed description of environmental conditions and processes associated ~iith natural as well as seeded clouds, and to establish the dominant precipita- tion mechanism in Texas; (3) To collect mesoscale meteorological data befor~, during, and after cloud seeding from which to investigate the interactions be1:ween 2 " ., "