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利用WRF中尺度数值模式和FNL再分析资料,结合常规观测资料,对2015年08月03日发生在鲁西北地区的暴雨过程其进行了诊断计算、数值模拟和机制分析.研究表明,急流对上游强降水释放潜热向下游的输送和沿急流南侧传播的重力波共同影响是此次暴雨形成的重要因素:(1)上游地区降水过程的潜热释放通过西风急流输送到下游,使滨州地区对流层上层暖平流显著增强,引起强烈的上升运动;(2)高空急流南侧激发的中尺度重力波沿西风急流自西向东传播,波峰促使不稳定能量释放而触发强对流天气.“,”A diagnostic calculation, numerical simulation and mechanism analysis were made for the heavy rain occurred in northwestern Shandong Province on BST 3 August 2015, which were based on the WRF meso-scale numerical model and FNL data.The study showed that the potential heat transferred by westerly jet stream and the mesoscale gravity wave along south jet stream both affected the rainstorm.The potential heat in upstream can be transferred to downstream by westerly jet and cause non-adiabatic heating in Binzhou, which can lead to warm advection and anticyclonic vorticity increase.Mesoscale gravity wave may occur in south of westerly jet stream and spread along the jet, and its wave crest may promote the release of unstable energy and raise a strong convective weather.