Related Clues:

• Seer's sign
• Warning sign
• Telltale sign
• Have a change of heart
• Sign of things to come
• Preacher's directive
• 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