Based on three-dimensional lightning location data from Zhejiang Province and volume scan data from the Hangzhou S-band Doppler weather radar, this study comparatively analyzes the lightning activity characteristics and their correlations with radar parameters during a hailstorm on March 25, 2024 and a rainstorm on August 20, 2024. The results show that: (1) Lightning activity in both events maintained good spatial correspondence with the intense echo core regions; however, the compositions of lightning types differed significantly. Both events were dominated by cloud-to-ground (CG) flashes, while the hailstorm exhibited higher absolute frequency and relative proportion of intra-cloud (IC) flashes. In the rainstorm, IC flashes were primarily concentrated during the most vigorous convective period. (2) Spearman correlation analysis reveals that the optimal radar parameter correlated with lightning frequency varies with weather type. For the hailstorm, areal parameters (≥40 dBZ echo area and ≥55 dBZ echo area) showed the most prominent correlations, whereas for the rainstorm, echo top height (ET) exhibited the best correlation. (3) Both events demonstrated lightning-based early warning indicators, albeit in different forms. In the hailstorm, a sharp surge in total lightning frequency preceded the first hailfall by 15–30 min, with a distinct "lightning jump" signature. In the rainstorm, the peak of ≥55 dBZ echo area led the peak of total lightning frequency by 30 min, presenting a more pronounced indicative signal. (4) The distributions of lightning peak current differed notably between the two events: positive CG peak currents exhibited similar distributions in both cases, while negative CG peak currents differed significantly. The rainstorm featured overall stronger negative CG peak currents, with higher median values and a greater proportion of high-amplitude events compared to the hailstorm. Furthermore, negative CG peak currents during the hailstorm showed a systematic decrease from the pre-hail to post-hail phase, with the difference being highly significant as confirmed by the Mann-Whitney U test, suggesting its potential as an electrical indicator for hail phase transitions. These findings provide a reference for optimizing lightning-based nowcasting strategies for different types of severe convective weather.