冰晶是霰的主要来源，而且也是霰生长的主要因素。初始的霰粒主要由冰霰自动转化生成，而较少由雨滴冻结生成。
Ice crystals are the main sources of graupels, which are produced mainly by auto conversion from ice crystal to graupel and a few grow by collection of ice crystals.
降水通常是由雨滴的合并作用引起的小雨或毛毛雨，因为冻结高度比较多地倾向于在逆温层之上，尤其是在夏季。
Precipitation is usually light rain or drizzle formed by coalescence since the freezing level tends to be above the inversion layer , particularly in summer.
降水通常是由雨滴的合并作用引起的小雨或毛毛雨，因为冻结高度比较多地倾向于在逆温层之上，尤其是在夏季。
Precipitation is usually light rain or drizzle formed by coalescence since the freezing level tends to be above the inversion layer , particularly in summer.
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