黄土高原一次连续性强对流天气分析

利用常规观测资料、自动站资料、榆林市CINRAD/CB多普勒天气雷达观测资料和NCEP1°×1°逐6 h再分析资料,对2014年6月29日、30傍晚发生在陕西榆林市黄土高原地带的一次强对流天气进行了综合分析。结果表明:甘肃东部到陕西的低槽是此次强对流天气直接影响系统,地面干线和辐合线触发此次对流天气;降雹区上空的垂直运动较强,对流有效位能较大,低层充沛的水汽通量输送明显,水汽通量散度汇合在陕西北部、适宜的0℃、-20℃层高度,为强对流天气的出现提供有利条件。三体散射长钉、超过8 km的50 d Bz强回波区、中等强度涡旋、逆风区都对冰雹天气预警有较好的指示意义。

Mechanism analysis of a strong convective weather in the Loess Plateau

By using conventional observation data, automatic station data and the city of Yulin CINRAD/CB Doppler radar data, NCEP1 ~ 1 degrees by 6h reanalysis data of June 29, 2014, 30 occurred in the evening of a strong convective weather in the Loess Plateau area of Yulin city in Shaanxi conducted a comprehensive analysis. The results show that the low trough in eastern Gansu to Shaanxi is the strong convective weather directly affects the system, the ground convergence line trunk and the trigger for the strong convective weather, hail area over the vertical motion, Cape is large, low layer abundant water vapor flux, water vapor flux divergence and convergence in northern Shaanxi, suitable for 0 DEG C -20, layer height, provide favorable conditions. Three body scattering spikes, more than 8 km 50D Bz strong echo area, moderate intensity, wind vortex zone has a good indication of the hail weather warning.