THE CHANACTERISTICS OF LICHTNING FROM CLOUDS TO GROUND ACCOMPANYING WITH HAILSTONES,THUNDERSTORMS AND GUSTS

According to the data from 3 stations of mesoscale weather system experimertal base in Beijing.Tianjing and Hebei.20 cases of hailstones with gusts weather process from 1989 to 1992 were analyzed.The results showed that the activity of lightning from cloud to ground was a process with gusts.The positive charge of lightning from clouds to ground was dominant.The negative charge,of lightning from clouds to ground correlated to heavy rainfall.The occurence of lightning coincided with the thunderstorms twenty five minutes earlier than hailstones on an average.It appeared 10-50km righthand in front of hailstone clouds.When positive charge lightning occurred at the rear part of hailstone clouds, it was the occuring and strengthening stage of hailstones; when the concentrating area of lightning overlapped with the body of clouds, it was the strongest stage of the hailstone process: when the lightning was at the frontal part of the clouds and separating it was the weakening and disappearing stage of the hailstone clouds.These characteristics were suggestions for nowcasting.