Reanalysis on Hail Suppression Weather Prewarning of the “8.21” Rare Hail in Shenyang

[Objective] The research aimed to analyze hail weather during 18:30-19:30 on August 21,2011.[Method] Based on NCEP 6 h reanalysis data,Micaps data and FY-2 satellite cloud image,the weather situation field,hail characteristic meteorological element field and satellite cloud image of the hail weather during 18:30-19:30 on August 21,2011 were reanalyzed.Weather causes of the hail and characteristic of the satellite cloud image were discussed.We summed up how to conduct prewarning analysis of the hail suppression weather from the live weather data and numerical forecast products.[Result] In occurrence and development process of the hail weather,cold vortex at 500 hPa was background weather system.850 hPa warm tongue and ground wind shear were essential conditions for forming strong convective hail cloud.Weather chart at early time was analyzed.It could analyze occurrence reason of the weather from mechanism aspect of the weather system,and issue weather prewarning as early as possible.Numerical forecast products were used to analyze hail characteristic meteorological element field.It could further analyze and accurately predict occurrence probability,time and range of the hail.Infrared satellite cloud image was more accurate for monitoring of the strong convective hail cloud,which could intuitively predict occurrence of the hail weather.[Conclusion] The research offered some hail suppression prewarning experiences for the future similar hail weather.