【摘要】 本文以 1996年 12月 31日和 1981年 5月 1日为例 ,对冬、春季节发生在江苏的较大范围的切变类冰雹天气过程作了对比分析。结果指出 ,无论冬季或春季当高原东部有深槽东移 ,冷暖空气在江淮地区交汇 ,地面抬升系统为暖切 ,并有大气层结不稳定 (Δθse( 50 0 - 850 ) <0℃ =中心和较强的风向和风速垂直切变、85 0hPa西南急流轴、85 0hPa最大水汽通量轴线、5 0 0和 85 0hPa正涡度中心等相配置时 ,就可能导致江苏地区较大范围强对流天气的发生。更多还原

【Abstract】 Two hailstorm cases occurred on 31 December,1996 and 1 May,1981 respectively in Jiangsu were analyzed for comparing the hailstorm formation conditions between winter and spring. The results showed that the severe convection might occur in Jiangsu when the profound trough moving eastward from Tibet Plateau; the cold air and the warm air meet each other in Jianghuai area; there were the warm surface shearing deformation on surface, instability center of atmospheric structure, stronger vertical wind shear, southwest jet axis and the strongest vapor flux axis on 850hPa, the positive vorticity center on 500hPa and 850hPa.更多还原