A heavy rainfall process during 6—7 June 2006 in the Fujian area is simulated by the fine-meshed WRF mesoscale numerical model developed by multi-agency of USA,and a concept model is also constructed.The analysis of the output data indicates that the mesoscale low-vortex was one of the dominant systems in the process and its spatial and temporal evolution characteristics were in accord with the movement and rainfall rate of precipitation center.The disposition of the intensive ascending motion at the center...