Related Clues:

• Forewarning
• Sign of foreboding
• Dark clouds on the horizon, say
• Portentous event
• Dark clouds, say
• Evil sign
• Hooting owl, maybe
• *Eclipse ... black cat ... future
• Warning
• Writing on the wall
• Bodement
• Black cat, perhaps
• Black cat, to some
• Black cat, e.g.
• Black cat, say