Abstract: The hail process is affected by the eastward movement of the upper-altitude trough, the southwestern airflow on the south side of the low-level shear, and the inverted trough on the ground. The sounding chart is in an unstable state at 08:00. When the highest temperature reaches 28℃ in the afternoon, pay attention to convective weather. The specific humidity in spring should be more than 10 g/kg. In March, the K index will reach 37℃, the SI will be negative, and the 0℃ layer will be around 4 km, or the combined reflectance factor will reach 65 dBZ or above, and 4 individual sweeps will continue. The service should consider the impact of hail weather.