Evolution Characterictic of Airflow for Local Thunderstorm

Based on aerological observations at the hail suppression experimental stations of Yongdeng and Minxian counties of Gansu Province during 1979-1987,as well as surface meteorological observations at the same time,the upper winds under the six different weather conditions of strong hailstorm,weak hailstorm,thunderstorm,shower,overcast and sunshine were analyzed.Results show that significant defference prezented in low air wind direction shear,middle air wind velocity shear and jet in upper air before haill falling under the strong hailstorm weather condition compared with those of other weather conditions,which is useful to forecast hailstorm and study its formation mechanism.