Characteristics of Cloud-to-ground Lightning during a Local Rainstorm in Meizhou City.

Based on cloud-to-ground lightning data of lightning location system, Doppler radar data, and precipitation data of regional automatic weather stations, the characteristics of cloud-to-ground lightning during a local rainstorm on June 4, 2016 in Meizhou City were analyzed. Theresults showed that the spatial distribution of cloud-to-ground lightning from 14:00 to 20:00 on June 4, 2016 in Meizllou City had obvious local charaoteristics, and the proportion of negative lightning was larger than that of positive lightning (only 16.8%). The concentration period of positive lightning coincided with that of cloud-to-ground lightning. The peak of proportion of positive lightning lagged behind the peak of cloud-to-ground lightning, and appeared in the late period of thunderstorm disappearance. The dense area of cloud-to-ground lightning and the area with heavy rainfall coincided with the area with strong radar echoes. Doppler weather radar data had the feature of the headwind zone, strong combined reHectivity, vertical height of strong echoes, high echo top, and fast radial movement. The peak of cloud-to-ground lightning appeared one hour earlier than that of precipitation. There was no significant correlation between the frequency of cloud-to-ground lightning and precipitation. The peak of negative lightning corresponded to that of positive lightning, and cloud-to-ground lightning ended earlier than rainfall. After the peak of precipitation, convective system rapidly weakened and disappeared. Precipitation and the frequency of cloud-to-ground lightning fluctuated frequently during the whole process. The jumps and peeks of negative lightning were indicative of rainfall changes. [ABSTRACT FROM AUTHOR]