晋中市雷暴天气变化特征分析

本文对晋中市近40 a雷暴天气资料进行统计,分析了年雷暴日数的变化特征及其时空分布情况,表明了晋中市雷暴日数呈逐年下降趋势,但下跌趋势不大,在过去的40 a中大约减少年平均雷暴日数1 d;一年中雷暴的活动期在5月～9月,活跃期6月～8月的平均雷暴日数占全年的76.1%。年雷暴日数的空间分布特征为西部平川地区明显少于东部山地区域。

Climate Characteristic Analysis of the Thunderstorm in Jinzhong

Based on the thunderstorm data of jinzhong city in recent 40a,the spatial and temporal distribution of the thunderstorm days is studied.The result shows that the annual thunderstorm days has a weaker decreasing trend at a mean rate of 1 day per year.We also can find that the active period of thunderstorm is in May to Sep,the number of thunderstorm days in peak period during Jun to Aug is 76.1% of that of total year.There are fewer thunderstorms in the west flat areas than the east mountain areas obviously.