Analysis of radar echo for a thick squall line process in Yuncheng;

Application of  vector in analyzing two squall lines occurred in Fujian;

Analysis of squall lines occurrign in cold vortexes over Northeast China;

Using conventional observational data, autographic records and satellite images, the authors studied a black storm caused by a dry squall line associated with a southern cold front at the northern foothills of Tianshan Mountains in Xinjiang on April 18, 1998.

This article analyzed the background situation of squall line weather at upper air from May to september in recent years in Jinzhong, discovered the forecast index of squall line droping area in Jinzhong with the diagnosis analysis of objective weather charts and the physical quantity.