Harbinger
noun
A person or thing that foreshadows or foretells the coming of someone or something.
One who provides lodgings; especially, the officer of the English royal household who formerly preceded the court when travelling, to provide and prepare lodgings.
Synonyms: forewarning, herald, omen, premonition, prophet, sign, signal
verb
To announce or precede; to be a harbinger of.
Synonyms: herald