Analyses on Lightning Temporal and Spatial Characteristics in the Severe Convective Weather in North China

Based on the lightning location detection(DF) data,Doppler radar data and synoptic information,the lightning characteristics of a typical mesoscale convective system in the north of Shandong Province on August 1st,2005 are presented.It is found that the negative lightning(-CG) is predominant to positive lightning(+CG) during the whole lifetime of thunderstorm.The maximum flash rate is 260 flashes in per five minutes.The comparison of location of lightning activity and radar echo shows that-CG usually cluster in the intense echo region with high reflectivity(40 dBz),while +CG usually disperse in the weak echo such as stratiform region or cloud anvil.The lightning flash changes with different echos,the maximum lightning flash rate occurred in the echo within 45~55 dBz.A good correlation is observed between the cloud height of 30 dBz and lightning flash rate,and validates the exponential relationship between them.