Related Clues:

• Red sky, to a sailor
• *Black cat, supposedly
• Show penitence
• Wedding-day rain, to some
• Bit of foreshadowing
• Shakespeare's 'temple-haunting martlet' is a good one
• Take it as a sign
• Dark clouds, to some
• Eclipse, to some
• Portentous sign
• It may be a good sign
• Augur's concern
• Black cat, supposedly
• A sign of a future event
• Portent or harbinger