烟台西北部两次局地大暴雨对比分析

目的]分析2009年7月和2010年7月烟台西北部2次局地大暴雨过程。方法]选取2009年7月和2010年7月烟台西北部2次局地大暴雨过程,利用常规和非常规天气资料,从环流背景、物理量场、雷达回波等方面进行对比分析。结果]2次大暴雨过程均为局地对流性强降水,暴雨落区均位于烟台西北部地区,且均有200 mm以上强降水中心;2次大暴雨过程均受副高和切变线影响,暴雨区均与588 dagpm线位置、西风带低槽、切变线的位置密切相关,是较为典型的副高边缘暖湿气流与西风带低涡、切变线共同作用引起的区域性暴雨过程;低空西南急流为大暴雨的产生提供了充足的水汽来源,大暴雨发生在水汽通量散度中心附近;K指数对大暴雨的发生具有较好的指示作用,大暴雨发生在K指数高值附近,2次大暴雨过程的K指数≥34℃,均接近于暴雨落区K指数≥35℃指标;2次大暴雨过程在0.5°仰角的反射率因子最大回波强度均为55～60 dBz,带状强回波自南向北经过半岛西部地区,形成列车效应。数值预报产品对局地大暴雨的预报也有重要的参考依据。结论]该研究为今后大暴雨预报提供借鉴和参考。

Analysis of the Comparison of Twice Regional Large Rainstorm in Northwest Yantai City

Objective] The twice regional rainstorms in northwest Yantai in July in 2009 and July in 2010 were expounded.Method] The twice regional rainstorm in northwest Yantai in July in 2009 and July in 2010 were selected for comparison analysis by dint of routine and non-routine weather data,from the aspects of circulation background,physics quantity,and radar echo etc.Result] The twice large rainstorm process were regional convective strong precipitation.The rainstorm fell in the northwest of Yantai and had a s...