NUMERICAL SIMULATIONS AND DOPPLER RADAR DATA ANALYSIS OF A HAIL PROCESS IN HUAIHE RIVER BASIN

A hail process in Huaihe River Basin observed by CINRAD Doppler radar on 12May 2000 has been simulated by using nonhydrostatic mesoscale numerical model MM5.The simulated wind field is analyzed and compared with Doppler radar wind data,both of them show that there was a meso-β cyclone around the hail region.Results show that this meso-β cyclone existed below 3 km in the troposphere and its cyclonic circulation was very obvious below 1 km.The temperature and moisture fields from the simulation are also analyzed.Furthermore,the storm-relative environmental helicity and CAPE(convective available potential energy) are discussed.