Diagnostic Analysis of Hail Weather in Guyuan on August 25,2011

[Objective] To study a strong convective hail weather process in Guyuan.[Method] By comprehensively using conventional observation data,numerical forecast products and Doppler weather radar data,a strong convective hail weather process which happened in Guyuan on Aug 25,2011 was analyzed.[Result] The strong convective weather was mainly affected by the high-altitude cold air,lower warm-wet airflow and shear line.The low-level convergence and high-level divergence,strong rising,lower warm-wet airflow and water vapor supplies offered favorable dynamical conditions for the hail occurring and developing.HI(Hail Index) is an effective radar forecast index of Hail in Guyuan.Reflectivity and VIL(Vertical Integrated Liquid) are significantly correlated with hail weather.[Conclusion] The research accumulated the experience for the short-term forecast and nowcasting work of strong convective weather in future.