A two-dimensional kinematic model of warm-frontal precipitation has been employed to model the sulfur chemistry of warm-frontal rainbands. Analysis of the model results indicates that nucleation scavenging, in-solution oxidation of SO2, and impaction of particulate sulfate by hydrometeors all contribute significantly to wet sulfate deposition, with nucleation scavenging generally the most important process. The model results also indicate that, in general, sulfate deposition will be a nonlinear function of the initial amount of sulfur species. Model predictions of sulfate concentrations in rain from warm-frontal rainbands and the variability of these concentrations within individual rain events are in accord with observations.