楚雄罕见暴雨天气特征分析

An analysis of a heavy torrential rainfall by radar echo in Chuxiong

利用711数字化测雨雷达探测到的2003年6月16日晚楚雄市至南华县发生的特大暴雨天气进行分析,结果表明:这是一次中尺度云团背景下强雷暴对流单体引发的高强度降水;强雷暴对流单体的生命史长达6个半小时,属我州罕见;强对流单体在暴雨区的稳定和逆时针旋转是本次特大暴雨的主要特征;地面气象要素的变化对探测到的回波生消演变具有较好的指示性。

Based on a radar echo analysis of the heavy torrential rainfall in the area from Chuxiong City to Nanhua in the evening on June 16, 2003, the present paper points out that the heavy rainfall is caused by the strong thunderstorm convection under the middle measure cloud system. The strong thunderstorm convection lasting 6 hours and a half is very rare in Chuxiong, and it is featured with stability and reverse circumrotation. The changes of surface weather elements are the better indications for the appearance and disappearance of radar echo.