Nouns

(n)presagea foreboding about what is about to happen
(n)omen, portent, presage, prognostic, prognostication, prodigya sign of something about to happen“he looked for an omen before going into battle”

Verbs

(v)bode, portend, auspicate, prognosticate, omen, presage, betoken, foreshadow, augur, foretell, prefigure, forecast, predictindicate, as with a sign or an omen“These signs bode bad news”