【摘要】 根据7个例子的对比分析表明:湿有效能量对预报暴雨具有较好的指示性,但在某些条件下湿有效能量在有无暴雨发生两者上并无明显差别。对暴雨和无暴雨个例的动力条件分析表明:(1)有暴雨时,在杭州地区为一个相对辐散区(300—900百帕),并伴有较强的上升运动,无暴雨时则为相对辐合区;(2)暴雨时高空有一支强的急流,暴雨区位于高空发散流场和急流中心的入口区右侧。(3)稳定度大小两者也有明显差异。分析结果对业务预报有一定参考价值。更多还原

【Abstract】 The analysis of the seven cases suggests that the features of moist avail- able energy are indicative of the formation of heavy rain, but under some conditions, there is no significant indication. The dynamic analysis of the cases with or without heavy rain shows : (a) The positive relative diver-gence (300-900 hPa) and strong ascending airflow are found over the area with heavy rain, whereas negative relative divergence is found over the area without heavy rain; (b) Heavy rain area is located under the upper tropospheric disperse airflow and on the right side of the entrance of the upper jet streak; (c) Their stability conditions are obviously different. The findings are of some reference to the operatinal diagnosis and prediction of heavy rain.更多还原