关键词: 多普勒天气雷达, 超级单体, 有界弱回波区, 中气旋, 垂直液态水含量

Abstract:

A severe convective storm process occured in the middle of Gansu province on May 30，2005 was analyzed by using CIN·RAD／CC Doppler weather radar data．It is found that the main meso—scale system causing this 8evere convective storm was the squall hne．The storln first appeared at 15：00，then moved to the southeast，and from 16：15 to 17：03 the multi—cell storm became more strongly and developed into the super—cel storm with the characteristics of vortex and zonal echoes．Th ere were two obvious outflow boundaries observed in south of the supercel lying to the southwest and southeast of the hook echo of the storm ，respectively．The shape of the low elevation reflectivity in the left front flank of the superceU was an inverted“V”，the maximum of echo intensity ap-poared in the bounded weak echo zone with the value over 70 dBZ．Th e corresponding radial velocity maps showed a strong mature me·so—cyclone feature．In this period the maximum vertical integrated liquid water(VIL)reached above 70 ks／m and the height of echo top(ET)was 17—18 km．Hence，this storm presented the typical features of superceU storms．

Key words: Doppler weather mdar, supercel, bounded weak echo zone, mesocyclone, vertical integrated liquid water content