《宋书·志·卷三十》
先出现雷电而后下雪，是因为阴气寻到了间隙。勃然兴起胜过阳气。逭预示悖逆弑主的灾祸将会来临。
先震电而后雪者，阴见间隙，起而胜阳，逆杀之祸将及也。
Thunder appearing before snowfall was because the yin energy had found an opening, and its vigorous rise had overcome the yang energy. This was an omen that a disaster of defying and killing the lord would occur.