Mesoscale Characteristics Analysis of a Rainstorm Process

By using the conventional meteorological data,physical quantity analysis and the radar echo data,a rainstorm process occurred in Dezhou on the night of June 18 to 19,2009 was studied.The results show that Mongolia trough in front of the west wind jet zone provides strong warm conditions for the rainstorm at 500 hPa.The rainstorm happens at northern low layer wind shear and surface convergence line.At early rainstorm,vapor transport conditions are better at low level.It is provided the better conditions for the heavy rain that the vertical motion below troposphere and the low level convergence and high level divergence.There is an obvious γ mesoscale features at period of heavy precipitation and a convergence to the north and south of the belt in the west of Dezhou,which is consistent with the ground situation,and also consistent with the period of rain.