an omen or prophecy
good or bad
No, an omen is a sign, which can mean good, bad, dangerous, etc. And a warning is something that is going to happen. For example the clouds are dark grey, that is a warning that a storm is coming. A omen is something religious and can be and mean different things to different people.
to blurtit out
It is a bad omen
Good luck
The word "Kizashi" is a Japanese word that means "omen" or "premonition." It can also be translated as a sign or indication of something to come in the future.
There have been at least five Omen films. The Omen(1976), Damien: Omen II (1978), Omen III: The Final Conflict (1981), Omen IV: The Awakening (1991) (TV) and The Omen (2006), which is a remake of the first movie.
Omen
Your sharp eyes serve you well.
Anything you wish it to. Or nothing at all to most people.
It depends on context. "The meteors were an omen of pending disaster" or "the patrol's appearance was an omen of more to come" are both acceptable.