安徽省2008年初夏1次强对流天气的分析

发生在2008年6月3日安徽江北的天气是1次受多个雷暴单体影响的强对流天气过程。通过分析常规观测、卫星云图、雷达探测和收集的灾情等,了解到这次强对流天气的大尺度环流背景、对流参数、抬升系统等。结果表明,在这次强对流发生时,地面处于暖低压内,高空东北冷涡有弱冷空气扩散南下,安徽北部K指数大于30,0℃层高度约为3 km,层结弱、不稳定,并且局地湿度大,对流层低层风垂直切变大,地面冷锋东移南下触发强对流发生,在安徽江北地区产生了多处局地强度大、冰雹、雷电、大风灾害严重的雷暴云。在多普勒天气雷达回波上可见典型超级单体风暴的特征:反射率因子强,低层反射率梯度大,有钩状回波,中层有界弱回波区,高层悬垂体,速度图上有一对法向对称的正负速度中心,低层气旋和高层反气旋,有冰雹指数和中尺度气旋产品等。

Analysis on A Severe Convective Process Occurred in 2008 Early Summer at Anhui Province

There are several thunderstorms at Jiangbei of Anhui Province on June 3th 2008.The routine data,cloud chart,radar echo and damage information show that there is weak cold air sweeping the Jiangbei from the Northeast at high level.There is a warm low pressure center in the Anhui surface.K index is larger than 30 at Jiangbei of Anhui Province.the altitude of 0 ℃ is about 3 km.There is small convective available potential energy,local humidity is big and there is large wind vertical shear at low level.When surface cold front moved southeast the severe convective weather occurred companying lightening,gale and hail. There are supercells characteristics in radar echo.These are big reflectivity, large reflectivity gradient at low level,hook,bounded weak echo region,overhang at high level,cyclone at low level,anticyclone at high level,hail index and mesoscale cyclone.