盛夏大范围雷暴预报的一种方法

A Technique for Forecasting, Thunderstorm Field in Midsusummer

本文提出一种利用挟卷载水稳定度指数(W_(EL)指数)作盛夏午后大范围雷暴落区预报的方法,这种方法较之文献〔2〕方法在两方面作了重要改进。其一是用大尺度涡、散度和R_i数对W_(EL)指数中的云底升速作了参数比处理,其二是将稳定度指数推广应用于作大范围雷暴落区预报。使用32个个例对本文的方法作了预报试验,结果令人满意。

In this paper, by utilizing WEL stability index, a theonique was presen- ted for forecasting thunderstorm field in midsummer. The technique has improved upon WEL s’ability index in the parameterization of the updraft at cloud base in WEL index having been processed by using vertical vorticicity, divergence and Richardson number. Test results for 32 cases are satisfactory.