摘要
利用常规资料和多普勒雷达资料,分析了2011年6月24日洛阳嵩县冰雹天气过程。结果表明:高空横槽转竖,干冷空气入侵,中低层强的偏东风辐合,暖湿气流辐合上升,为冰雹的发生提供了有利的动力和水汽条件;高空冷平流,低层暖平流,为强对流性天气的发生提供了不稳定层结;适宜于冰雹生成发展的0℃层高度,指示有利于对流发展的各类指数,为冰雹的分析预报提供了较好的依据;早期的雷达回波信号及其所带来的天气,为提前对强对流天气性质正确判断和监测预警提供了较好的参考信息;强度>55 dBz的回波高度高于-20℃层高度,VIL值>60 kg/m2,回波顶高>12 km,有中气旋出现等,是降雹的可靠信号。
By use of conventional data and Doppler radar data, the hail process on the June 24, 2011 in Luoyang Song county was analyzed. The results show that the heavy hail is due to high-altitude vertical cross-slot switch, dry cold air intrusion, strong easterly winds in the low-level convergence, con- vergence of warm air rise, which provides favorable power and water vapor conditions for the occurrenceof hail. The high-altitude cold advection, low-level warm advection, provides unstable stratification for the occurrence of severe convective weather. The 0 ℃ layer height which is suitable for the development and generated of hail, the various types of index which is conducive to the convection development, pro- vides a good basis for the analysis and prediction of hail. The early radar echo signal caused by the weather provides reference information for judging convective weather nature and monitoring and early warning. The intensity over 55 dBz echo height is higher than - 20℃height, VIL values is over 60 kg/ m^2, echo top height is over 12 km and mesocycyclone is appear are reliable hail signal.
出处
《气象与环境科学》
2012年第1期62-66,共5页
Meteorological and Environmental Sciences
基金
洛阳市气象局科研项目"洛阳市强对流天气预报预警系统"(201201)资助
关键词
大冰雹
高空冷涡
横槽
雷达回波特征
large hail
high-altitude cold vortex
horizontal tank
the radar echo characteristics
