2017年7月昭通冰雹天气分析

本文利用NCEP再分析资料、宜宾和威宁探空资料、昭通多普勒天气雷达观测资料对2017年7月昭通出现的冰雹灾害天气进行统计分析,结果表明出现的冰雹天气具有以下几个主要特征：1)冰雹的发生与西太平洋副热带高压、青藏高压有紧密的联系； 2)在干入侵、上干下湿、湿层深厚这三种中低空配置下昭通都可能会出现冰雹天气；3)订正到14时后的对流有效位能比08时的更具指示意义；4)冰雹云的最大回波强度在55dBz以上,回波顶高达到10km以上,风暴顶高超过回波顶高的70%,最大单体垂直液态含水量值在14 kg/m₂以上。

Analysis of hail in Zhaotong in July 2017

Based on the NCEP reanalysis data and the T-LogP data of Yibin and Weining station and the Doppler radar data of Zhaotong station the hail in Zhaotong in July2017 was analysed. The results show that the hail has the following major characteristics:1)The hail was releated to the West Pacific Subtropical high and the Tibetan high;2) In the case of dry invasion,dry on the wet and deep wet layer configurations hail may happen in Zhaotong;3)The convective available potential energy corrected to 2pm was more indicative than the convective available potential energy at 8am;4) The maximum radar reflectivity of hail cloud was more than 55dBz, the echo top reached more than 10km, the storm top exceeds 70% of the echo top and the maximum Vertical integrated liquid was above 14 kg / m2.