新疆石河子地区一次冰雹天气的综合分析

Composite Analysis of Hailstone Weather Happened in Shihezi Area of Xinjiang

利用常规气象探测资料和多普勒雷达产品,结合石河子地区高密度的自动站网资料,对2009年7月19日石河子地区一次冰雹天气过程,从天气形势、物理量场和雷达回波演变特征等几个方面进行了综合分析。结果表明:这次冰雹天气出现在对流不稳定层结条件下,中高层干冷低层暖湿,水汽条件充沛,0℃层和-20℃层的高度适宜,同时具有强的垂直风切变。多普勒雷达能很好地监测冰雹天气的发生发展演变过程,大于50 dBz的强回波区和穹窿结构的出现,逆风区的出现、垂直累积液态含水量(VIL)和雨强(RZ)的急剧增加以及风暴跟踪信息(STI)预警等都对冰雹的出现具有指示意义,对今后的防雹减灾工作有较好的应用价值。

By using the routine sounding data, Doppler radar echo data and ground automatic station data, this paper analyzed a hailstone weather took place in Shihezi region on July 19, 2009. The results are as follows： the hailstone weather occurred under the condition of convection instability stratification, i.e. dry and cold in the middle-high layer, warm and wet in the low layer, sufficient water vapor, the befitting height of 0℃ layer and 20℃ layer, and strong vertical wind shear simultaneously. Doppler radar could primely monitor hailstone weather development and evolvement. The occurrence of dead wind region and strong echo regions with higher than 50dBz and cove configuration,the intense increase of vertical integral liquid water content （VIL）, rain intensity（RZ） and the storm track information （STI）are indicative to hailstone weather. This study has preferable application value for hail prevention and disaster abatement in the future.