Characteristics of the Mesoscale Echo System Ahead of Cold Front and Its Relationship with Heavy Rains

Based on the following data: the continuously observed radar echo data from Beijing, Shijiazhuang, Dezhou, etc., 3-hourly satellite cloud pictures from GMS; hourly aviation surface observations in North China; and hourly precipitation records taken from climatological stations in Beijing, Tianjin and some regions of Hebei and Shandong Provinces, the characteristics in the formation and development of the mesoscale echo system in the warm sector ahead of cold front during 3—4 July 1981 are analysed, as well as its regationship with heavy rains