A local heavy rainstorm in northeast and southern Hebei on July 18, 20 07 is analyzed by using conventional observation data, hourly data of automated weather station, TBB data and NCEP 6 hour reanalysis data. Conclusions are dra w n that although in the same synoptic system, the rainstorm formation mechanism i s different in different regions. It is revealed that the upperlevel and low le vel jet streams as well as the interaction between the positive feedback of the jets and rainstorm are the main reasons causing the northeast rainstorm in the m orning. The vapor is transported by lowlevel jet stream. There are roundli ke mesoα convective cloud clusters with TBB less than -70℃ in the image of th e FY-2C. The severe event in southern Hebei in the afternoon occurred under the f av orable conditions of the hightemperature, highenergy and unstable stratifica tion when instable energy was triggered and released by the co ld front and the lowpressure before the front. In the corresponding images there are quasitrans me ridian convective cloud clusters with minimum TBB less than -80℃. The streams a nd surface humidstatic energy calculated from automatic weather stations data h ave significant indication to prediction of this sort of summer strong convectio n weather.