旋转风螺旋度在广西春季一次冰雹大风天气分析中的应用

利用旋转风螺旋度对 2 0 0 1年 4月发生在桂中地区的冰雹大风天气进行分析 ,结果表明 :低层旋转风螺旋度对冰雹大风等强对流天气有一定的指示意义 ,冰雹大风天气易产生于低层正旋转风螺旋度大值中心与中低层对流性不稳定能量储存区所包围的区域 ,其上空 5 0 0 h Pa以下旋转风螺旋度为正 ,40 0 h Pa以上为负

Application of screwing degree of cyclone in the analysis of spring hailing weather with gale in Guangxi

The screwing degree of cyclone is adopted in the study on hailing weather with gale happened in April of 2001 in the central part of Guangxi. The result shows that the screwing degree of lower cyclone has an indication meaning to strong convection weather such as hail and gale. It indicated that hailing weather with gale normally happens in the area surrounded by high value center of the screwing degree of lower positive cyclone and the storage area of convective unstable energy at middle and lower altitude, and the screwing degree above this area is positive under 500HPA and negative above 400HPA.