淮北地区一次强风暴的弓形回波分析

Analysis of the Bow Echo of a Severe Storm in Northern Part of Huaihe River

2005年7月16日淮北地区发生了一次强风暴天气过程。主要使用新建成的阜阳CINRAD-SA多普勒天气雷达观测资料,辅以天气图、本站高空观测、地面观测资料,对此过程进行了综合分析。结果表明:这是一次以灾害性大风为主、有雨暴相伴随、局部还有冰雹发生的强对流天气过程。影响系统是一条中-β尺度的弓形飑线回波带。弓形回波带是由更早些时间出现的弧形的阵风锋触发而成的。中层干冷空气的侵入加强了对流云体中的下沉气流和低层出流,形成阵风锋。在如何综合应用如此丰富的雷达产品做好临近预报方面作了初步的尝试。

Using CINRAD-SA Doppler radar data in Fuyang, as well as weather chart, and the observation data at upper-air and surface, a severe storm weather process occurring in the northern region of Huaihe River on July 16, 2005 is analyzed. The results show that this is a severe convective weather process with catastrophic gale, rainstorm and local hailstone, and it was caused by a bow meso-β scale squall line echo belt, which was triggered by arc gust front in the earlier time. Further, the dry cold air into the cloud region at the middle-level intensify the downdraft and the lower-level outflow, and then the gust front was formed. On the other hand, an initial attempt to do nowcasting was made in terms of the synthetical application of various radar products.