中文摘要：

利用洪泽站1980—2009年30年雷暴观测资料,结合2005-2009年天气实况资料和雷达回波图,对洪泽湖地区强雷暴时空分布特征、变化规律及其成因进行了分析。结果表明：洪泽湖地区年均强雷暴日8.0 d,高发季节为6 8月,高发时段是04 06时和1 4 1 6时,年强雷暴日数年代际表现出先下降后上升的趋势。统计表明强雷暴主要产生在低槽冷锋、北方冷涡、中低空切变（槽）线、副热带高压4种天气系统中,中、低空均存在西南暖湿急流,850 hPa温度露点差位于≤-3℃湿舌内。强雷暴回波特点是：回波前有较强的垂直风向、风速切变,VIL值长时间维持在35 kg·m^-2预示伴有暴雨灾害大气;出现大风前,VIL值常常有明显减小趋势。暴雨持续阶段其负闪密集区同40 dBz的强回波区有很好的对应关系。

英文摘要：

By using the thunderstorm data of thirty years during 1980 to 2009,this paper has analyzed the time distribution characteristics and variation regularity of the strong thunderstorm in Hongze Lake region, and classified the synoptic situation of strong thunderstorm days in terms of weather maps during 2005 to 2009.It is found that the average annual strong thunderstorm day is 8.0 d,the main meteorological disasters accompanied by strong thunderstorm are strong wind and heavy rainfall;it is more likely to happen in June to August and most frequently at 4 am to 6 am and 14 pm to 16 pm of a day,which often sustained within 2 hours.The second order moving average（decadal change） goes up at first,and then falls down. The strong thunderstorm forms in four synoptic systems：trough cold front,northern cold vortex,low-level shear （trough） line,and subtropical high;at the same time the southwest jet exists in both low-level and high-level atmosphere, and the Hongze Lake region is in a wet tongue where T—T_d of 850 hPa is no more than—3℃.The main echo features of the strong thunderstorm are as follows;there is a sharp vertical shear before the echoes,and the remaining VIL value at the 35 kg·m^-2 implicates the appearance of heavy rainfalls;before strong winds,VIL value often declines evidently.And during the rainstorm,its negative lightning concentration region is in good correspondance with the strong radar echoes above 40 dBz.