Based on multiparameter radar (dualpolarization,dualwavelength,and Doppler)observations of early Summer severe storm accompanied by hail,reflectivity Z_h,specific differential phase K_dp at Sband and X-band specific attenuation A_x were applied to estimate rainfall rates.The estimates from radar parameters were compared with groundbased raingage measurements.The results show that both R-K_dp and R-A_x relations were in good agreement with the raingage data,that is,less than 10% difference in the rainfall accumulations.The R-Z_h relation produced similar results only when Z_h was truncated at 55dBz.This study demonstrates the potential of K_dp for estimating rainfall rates in convective rainstorms with rainhail mixtures.