Analyze on the Hail Radar Echo Characters of a Weak Convective Weather Process

Analyzing the data of radar and ground observation for a hail convective weather in Mahe valley of Xinjiang,we study the characters of radar reflectivity factor and vertical velocity field for weak convective hail cloud,and the relationship among the weak convective hail cloud,the lower 0℃ layer height and vertical wind shear.The results show that the height of 0℃ layer is the main essential for to analyze weak convective hail cloud,and the wind shear resulting from difference between high and low-level wind speed forms vertical acceleration,it makes convective movement strengthen and maintain,this is the dynamical mechanism for this hail weather process.By Analyzing this weak convective hail weather process,some important features and changes is revealed for weak convective hail weather occurrence and disappearance in Mahe valley of Xinjiang,and these analyses have the certain guiding significance for to identify and analyze hail cloud in future.