Tally of aircraft missions flown by class. (a) NOAA WP-3D missions--includes missions flown by N42RF and/or N43RF. (b) NCAR Electra missions. Total Electra mission indicated by lighter bars. Missions when ELDORA radar research data were continuously collected indicated by darker bars. (P. Hildebrand, personal communication 1994). (c) NASA aircraft missions, DC-8 lighter bars, ER-2 darker bars. For each aircraft there was one mission when satellite data was not available to make a classification. These missions are not included in the bar graphs. Some missions investigated convective systems of two different classes and were thus counted twice.