AgI-seeding should be done before the activation of most ice nuclei start, so as to enhance rainfall through increasing ice crystals content, and deleting super-cooled cloud water. 結果表明，該地區秋季對流雲降水主要為冷雲降水，冰晶是霰產生的主要來源，冰霰自動轉化是霰產生的最主要方式，冰晶與霰的碰並又促進了霰的進一步增長，霰是雲中過冷水消耗的主要因素。
Ice particles collide with super-cooled water to form graupel and hail particles, and the hail particles grow between the ascending and sinking currents. 冰晶碰並過冷水形成霰和冰雹，冰雹粒子在氣流循環處生長。
