With the use of an induction cylinder in conjunction with an optical array probe, simultaneous measurements were obtained of the size, shape, and charge of hydrometeors in a New Mexico thunderstorm. The particles with detectable charges (greater than 1--3 pC) were primarily graupel particles, and their charges are generally consistent with laboratory measurements of ice--ice collisional charging. The fraction with detectable charge increases with size, as does the magnitude of the mean charge. also, the positively charged particles occur primarily at higher temperatures (>-22 ¿C), and the degree of negative charging increases with decreasing temperature (down to -35 ¿C). ¿ American Geophysical Union 1991