On a microcomputer the comprehensive analysis is made on the diagnosis of physical quantities, radar echoes, satellite cloud pictures, wind profile by UHF radar, data about lightning and remotely-sensed water vapor, etc. in a partly man-computer interactive manner, and than the commended forecast by the microcomputer is put forward. This will serve for inproving the accuracy of forecasting severe convcctive weather, systems in flood seasons in Bejing-Tianjin-Hebei area and for forecast automation.