西北区东部一次雷暴天气过程的诊断分析

利用实况观测资料对出现在陕西地区2006年8月14日的一次雷暴过程进行诊断分析,结果表明:(1)此次雷暴过程的发生与500 hPa短波槽的东移发展以及副热带高压迅速南退有密切关系,同时对流层低层鞍型风场的存在有利于强对流云的发生发展;(2)雷暴过程前干暖盖的存在和维持有利于不稳定能量的聚积同时也抑制了水汽的垂直输送,不稳定层结的存在为雷暴的发展提供了重要机制.(3)动力学诊断分析显示,强PV中心的东移发展与此次雷暴过程密切相关,高空的强辐散和低空的强辐合是此次雷暴过程非常重要的动力学机制;(4)临近预报可分析临近站点温、压、湿风的垂直层结特征,参考上游站点的天气演变,密切监视雷达探测到的雷暴对流系统的移向、移速以及强度的变化做出合理预报.

Diagnosis Analysis on a Thunderstorm Event in the East of Northwest China

The diagnosis analysis for a case thunderstorm occurredon 14 August 2006 was studied utilizing the observed data in this paper.The main results were as follows:(1) The thunderstormevent has closely relationship with the trough at 500 hPa and the withdrawingof the western Pacific subtropical high.At the same time,the saddle pattern of wind field at low level of troposphere favored the occurrence and development of thunderstorm.(2) The existence and persistenceof dry and warm lids were in favor of accumulatio...