The goal of the 1989 field operations is to collect cumulus cloud data using aircraft and radars that will allow comparisons between similar clouds treated with silver iodide and those not treated with silver iodide (placebos of sand). Field operations are headquarted at Willard Airport (CMI) just south of the Champaign-Urbana campus of the University of Illinois. The study area, as shown in Fig. 1, includes all Illinois counties within a 100 mile radius of the airport. Some seeding operations will be conducted outside the study area and occasionally missions will be conducted in near by adjacent states for the purpose of collecting in-cloud data on natural clouds.published or submitted for publicationis peer reviewe
