2014年5月9日晚湘东北出现一次大暴雨天气过程。利用常规观测资料、中小尺度自动雨量站资料、多普勒雷达产品对此次大暴雨的"列车效应"雷达回波特征及其成因进行分析,并对这次过程的短临时预警服务进行了探讨。结果表明:"...2014年5月9日晚湘东北出现一次大暴雨天气过程。利用常规观测资料、中小尺度自动雨量站资料、多普勒雷达产品对此次大暴雨的"列车效应"雷达回波特征及其成因进行分析,并对这次过程的短临时预警服务进行了探讨。结果表明:"列车效应"回波带主要由积状云为主的混合型回波组成,对流强降水明显;低质心结构的回波特征有利于短时暴雨的发生;径向速度图上的"牛眼"特征表明有强盛的西南急流存在,"列车效应"发生在急流轴的左侧;逆风区的出现和长时间维持为"列车效应"提供了动力条件;925 h Pa湘西南-湘东北的切变线和地面低压倒槽暖区内出现的中尺度辐合线位置重合,配合低空西南急流的增强是形成"列车效应"的主要原因;多普勒雷达特征分析为短临预警服务提供了准确的判别依据。展开更多
利用高空、地面气象观测资料以及多普勒雷达资料,分析了2024年5月26日一次暖区暴雨天气过程,结果表明:1) 本次暖区暴雨发生时,常德位于高空槽前,受低涡切变东移影响,700 hPa和850 hPa西南急流加强,暖湿气流旺盛,地面有热低压倒槽发展,...利用高空、地面气象观测资料以及多普勒雷达资料,分析了2024年5月26日一次暖区暴雨天气过程,结果表明:1) 本次暖区暴雨发生时,常德位于高空槽前,受低涡切变东移影响,700 hPa和850 hPa西南急流加强,暖湿气流旺盛,地面有热低压倒槽发展,有弱冷空气南下,地面辐合线的加强触发强对流的发生发展。2) 暖区暴雨短期预报难度大,模式可参考性差,量级和落区均易产生较大偏差,应重点加强短临预警监测以及叫应联动等方面的服务工作。3) 双偏振雷达中差分传播相移率(KDP)与强降水的影响时间和强度对应较好,对强降水的短临监测预警有很好的指示意义。Using high altitude and surface meteorological observation data and Doppler radar data, the process of a warm rainstorm on May 26, 2024 is analyzed. The results show that: 1) When the warm rainstorm occurred, Changde was located in front of the upper trough, affected by the eastward shift of low vortex shear. The southwest jet streams at 700 hPa and 850 hPa strengthened, leading to abundant warm, moist airflow. At the surface, a thermal low developed over the trough, with weak cold air moving southward, and the strengthening of the surface convergence line triggered the development of strong convection. 2) The short-term forecast of a warm rainstorm is difficult, the model reference is poor, and the magnitude and fall area is prone to large deviations, so it is necessary to strengthen the service work of short warning monitoring and call response linkage. 3) In dual-polarization radar, KDP corresponds well with the influence time and intensity of heavy precipitation, which is a good indicator of significance for short-term monitoring and early warning of heavy precipitation.展开更多
文摘2014年5月9日晚湘东北出现一次大暴雨天气过程。利用常规观测资料、中小尺度自动雨量站资料、多普勒雷达产品对此次大暴雨的"列车效应"雷达回波特征及其成因进行分析,并对这次过程的短临时预警服务进行了探讨。结果表明:"列车效应"回波带主要由积状云为主的混合型回波组成,对流强降水明显;低质心结构的回波特征有利于短时暴雨的发生;径向速度图上的"牛眼"特征表明有强盛的西南急流存在,"列车效应"发生在急流轴的左侧;逆风区的出现和长时间维持为"列车效应"提供了动力条件;925 h Pa湘西南-湘东北的切变线和地面低压倒槽暖区内出现的中尺度辐合线位置重合,配合低空西南急流的增强是形成"列车效应"的主要原因;多普勒雷达特征分析为短临预警服务提供了准确的判别依据。
文摘利用高空、地面气象观测资料以及多普勒雷达资料,分析了2024年5月26日一次暖区暴雨天气过程,结果表明:1) 本次暖区暴雨发生时,常德位于高空槽前,受低涡切变东移影响,700 hPa和850 hPa西南急流加强,暖湿气流旺盛,地面有热低压倒槽发展,有弱冷空气南下,地面辐合线的加强触发强对流的发生发展。2) 暖区暴雨短期预报难度大,模式可参考性差,量级和落区均易产生较大偏差,应重点加强短临预警监测以及叫应联动等方面的服务工作。3) 双偏振雷达中差分传播相移率(KDP)与强降水的影响时间和强度对应较好,对强降水的短临监测预警有很好的指示意义。Using high altitude and surface meteorological observation data and Doppler radar data, the process of a warm rainstorm on May 26, 2024 is analyzed. The results show that: 1) When the warm rainstorm occurred, Changde was located in front of the upper trough, affected by the eastward shift of low vortex shear. The southwest jet streams at 700 hPa and 850 hPa strengthened, leading to abundant warm, moist airflow. At the surface, a thermal low developed over the trough, with weak cold air moving southward, and the strengthening of the surface convergence line triggered the development of strong convection. 2) The short-term forecast of a warm rainstorm is difficult, the model reference is poor, and the magnitude and fall area is prone to large deviations, so it is necessary to strengthen the service work of short warning monitoring and call response linkage. 3) In dual-polarization radar, KDP corresponds well with the influence time and intensity of heavy precipitation, which is a good indicator of significance for short-term monitoring and early warning of heavy precipitation.
