Using CINRAD/SA radar data in Jinan, combined with satellite, automatic weather station and other conventional data, the research about occurrenceanddevelopmentof a bow echo and severe convective stormwas studied in this paper. Bow echo and severe convective storms merged to form new bow echo, and it then developed by the process into comma echo. Firstly, Convective process tookplace under the background of horizontaltrough turning to vertical trough. The atmospheric environment existed large convective available potential energy(CAPE)and moderate-intensity low vertical wind shear. FY-2C satellite infrared images clearly showedthat the development andenhancement of bow echowere influenced by outflow boundary of neighbor cloud. At the same time, thetemperature, pressureand humidity observed from automatic weather station had strong changes within 20 min, obviously. Secondly, the result obtained from Doppler radar data indicated that it was a typical bow echo process, because the system evolved through a typical evolution of the bow echo at every stage, such as tall convective echoes, bow and spear-shaped stage, comma echo. Thirdly, the severe convective storm was in the warm area in front of bow echo about 75 km and moved slowly, with some characteristics of common storms. At last, during the stage about bow echo and severe convective storm merging, the bow echo was already in late comma-cloud system. With time going on, the supercell gradually closed to the neck of bow echo. After experienced short decrease, it strengthened rapidly and filled the weakened part of the bow echo. Supercell developed into bow echo withstrong rear inflow in the bow echo, and soon evolved into a comma cloud. The disastrous wind was produced at the rotating head of comma cloud.
Key words
Bow echo /
Severe convective st /
Downburst /
Doppler weather rada
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