湿位涡分析在河北东北部暴雨预报中的应用

应用湿位涡理论，对2008年6月25日发生在河北省东北部的1次局地暴雨天气进行了诊断分析。结果表明，暴雨产生在θse线陡立密集区附近，θse线陡立密集区附近对流稳定度较小，有利于湿斜压涡度发展，MPVI“高层正值区低层负值区垂直迭加”的配置是暴雨发生、发展的有利形势，暴雨区位于850hPa上MPVI零线附近，湿位涡在850hPa上具有MPV1〈0，MPV2〉0的特征，在夏季可以作为河北省北部预报暴雨的一个有效辅助工具。

Application of Moist Potential Vorticity Analysis in Forecasting Heavy Rain in Northeast of Hebei Province

By using the theory of moist potential vorticity(MPV),a rainstorm occurred in northeast of Hebei Province on 25 June 2008 was analyzed.The results show that the heavy rain occurred in the neighborhood of the stiff and dense section of Pseudo-equivalent potential temperature lines,where the convective stability was so small that it was beneficial to the development of moist baroclinic vorticity.The overlapping of the positive and negative MPV1 areas at the lower and upper level was advantageous to the develo...