harbinger [harbingers](that which foretells the coming of something) noun [UK: ˈhɑː.bɪn.dʒə(r)] [US: ˈhɑːr.bən.dʒər]
omen [omens](something which portends or is perceived to portend a good or evil event or circumstance in the future; an augury or foreboding) noun [UK: ˈəʊ.men] [US: ˈoʊ.men]