The paper presents interpretation of triple Doppler radar observations of a thunderstorm that occurred at the Kennedy Space Center, Florida. Precipitation particle motions inside the storm, as evaluated from the three velocity radar data sets, are presented in a selected vertical plane throughout the storm development. These data are interpreted and compared with observations of VHF radio emission sources and lightning charge centers derived from an earlier analysis (Krehbiel, 1981). The main feature of the particle motion field is the persistence, at nearly the same altitude throughout the entire period of analysis, of a ''balance level'' characterized by a zero value of the precipitation particle mean vertical velocity. Further analysis based on considerations of radar reflectivity and air velocity suggests the presence, at this altitude, of relatively large precipitation particles suspended in an updraft. The lightning negative charge centers appear to be less than 1 km above the particle balance level.