Related Clues:

• Storm clouds, to some
• Broken mirror, perhaps
• Eclipse, in olden days
• Soothsayer's aid
• An eclipse, to some
• It might be a bad sign
• Augural sign
• Dark clouds, often
• Spooky sign
• Comet, say, to the impressionable
• Meaningful sign
• A sign of things to come
• Warning of a sort
• A comet, to the superstitious
• Future sign