关键词: 雷 达 产 品 , 特 征 分 析, 强 对 流 

Abstract:

 Based on the hourly precipitation at 7 stations of Beijing and original data of CINRAD and derived products in Daxing，a heavy rainfall process which was intensive and local obvious and occurred on 23 June 2011 was analyzed in detail． The results showed that the convective system mingling with many meso － scale and micro－scale vortexes caused the heavy rainfall，and the meso–scale characteristic was obvious．The composite products of CINRAD could clearly capture the whole evolvement process of the weather system．The composite reflectivity，base reflectivity with multi －elevation angles and radial velocity of CINRAD described the subtle structure of convective cells and their evolution during the heavy rainfall process．The vertical cross section of convection cells depicted clearly the typical echo features of the heavy rainfall including rear inflow weak echo and echo overhang，the low level convergence and the upper level divergence． The storm tracking information and cell trend products derived by RGP monitored perfectly a large quantity of meso － scale vortexes during the heavy rain．The variations of the echo tops，echo bottom and maximum echo height of meso－scale and micro－scale vortexes reflected the changes of the intensity and structure，the air motion and raindrop activities in the occurrence and development of convection cells． The vertical liquid water content (VIL)and probability of hail(POH)were keeping the high value，which was well corresponding to rainfall intensity and precipitation．

Key words: heavy rainfall, CINRAD products, characteristic analysis