The literal state of wind and rain being imminent or storm clouds gathering.

乌云密布，一副风雨欲来的架势，路上的行人都加快了脚步。

A figurative description of an impending conflict, disaster, or a tense situation.

在战争爆发的前夕，整座城市都笼罩在一种风雨欲来的紧张气氛中。