Related Clues:
- Warning of mass extinction, now all kicking off
- Harrowing harbinger
- Eclipse, to the superstitious
- 666, perhaps
- ... with 'female only' sign
- Sometimes-bad sign
- Divine message, for some
- Red sky, to mariners
- Sign, of a sort
- Forecaster's sighting
- Sign sometimes upsetting
- Spooky occurrence in the board game Betrayal at House on the Hill
- Iconic Russian department store facing Red Square
- Fateful sign
- Halley's Comet, to William the Conqueror