Climatic and synoptic characteristics of thunderstorms in Chengdu area

Using the observational thunderstorm data between 1986 and 20000 the spatial and temporal distribution of the thunderstorms in Chengdu area are analyzed. The results show that the annual average number of thunderstorm days is between 24 and 30 in Chengdu area which is among those with more thunderstorms. About 2/3 thunderstorms occur in summer and none in winter. Urban heat island effect plays a positive role in triggering the thunderstorms. Practically the analysis of the thunderstorms weather provides a forecast idea when and where thunderstorms take place.