Just this watery mass again. So it's creation undoing itself in some of the descriptions, as opposed to just heavy rain.

又变成了一个大水球,这里是自我毁灭，而不是毁于倾盆大雨。

耶鲁公开课 - 旧约导论课程节选

and the rain is coming down, the lightning hits and there's thunder.

大雨倾盆，电闪雷鸣。

I'm afraid of 课堂 - SpeakingMax英语口语达人