2016年4月27日鄂西北冰雹天气多普勒雷达分析

Doppler Analysis of Hail Weather in Northwestern Hubei on April 27,2016

本文利用襄阳多普勒雷达资料对2016年4月27日鄂西北地区大范围冰雹天气进行分析,这是襄阳雷达建成后首次对大范围冰雹天气进行监测。结果表明,此次冰雹天气是在高空西北气流下发生的,地面有弱冷空气配合。附近探空站显示,0℃层和-20℃高度层分别在3 km和6 km以上,0~6 km垂直风切变达12 m/s,CAPE值>1 000 J/kg。雷达回波显示,降雹天气共分2个时段和2条路线,2次降雹天气有相同点,如最强回波强度达到65 d BZ以上、50 dBZ强回波伸展高度达6 km以上、对应回波顶产品高度达11 km以上、垂直积分液态含水量达40 kg/m2以上等;也存在一些不同,如路线不同、降雹性质不同、云团结构不同等。通过对雷达回波分析可以找出鄂西北降雹天气的一些特点,可以作为今后冰雹天气预报的参考。

In this paper,the Xiangyang doppler radar data was used to analyze the large-scale hail weather in northwestern Hubei on April 27,2016.For the first time Xiangyang was used to monitor hail weather in a wide range since it was built.The results showed that the hail weather occurred in the upper northwest airstream,and it was mixed with weak cold air in the ground.Sounding station data showed that the 0 ℃ layer was above 3 km and -20 ℃ layer was above 6 km,the 0-6 km vertical wind shear was up to 12 m/s,and the CAPE was greater than 1 000 J/kg.The radar echoes showed that there were two periods and two routes of hail weather.There were some similarities between the two hail days:the strongest echo intensity was above 65 dBZ,and the extension height of 50 dBZ was above 6 km,the height of corresponding echo top product was above 11 km,and the vertical integral liquid water content was above 40 kg/m2,etc.There were also some differences,such as the route,the nature of hail,cloud structure,etc.The characteristics of hail weather in northwestern Hubei can be found by analyzing radar echo, which can be used as reference for hail weather forecast in the future.