一次低纬高原特大暴雨天气的诊断分析

结合大尺度环流的高通滤波、卫星云图和雷达回波诊断，通过地面天气图分析等方法，对2003年6月17日云南中部的楚雄市至南华县一带发生的特大暴雨过程进行了中尺度分析。结果表明，这次过程是热带中尺度气旋东南移并发展造成的；地面强冷空气侵入中尺度低压导致对流发展，是热带中尺度气旋加强的原因；大尺度环流下，孟加拉湾、南海和北部湾形成的两条水汽输送带通过热带低压为强对流的发展和维持提供了能源保障；地面中尺度低压中心和与之配置的切变线北侧对特大暴雨落区有较好的指示。

Analysis of Mesoscale Heavy Rainfall in Low-Latitude Plateau Area

Base on Shum an-Shapiro mesoscale filter, high-pass filter under the background of large-scale circulation and analysis of satellite image and radar echo, the heavy rain in the central Yunnan on June 17, 2003 is analyzed. It shows that the rain can be attributed to the southeast movement and the development of a tropical mesoscale cyclone. The invasion of surface cold air to the mesoscale depression leads to the development of convective activities and the tropical mesoscale cyclone. The tansportation of water vapor from the Bay of Bengal, the South China Sea and west Pacific Ocean in large-scale circulation provides the energy to the development and maintenance of the strong convection. The center of the surface mesoscale depression and the north of the shear line are indicative to the rainfall area.