Possible Clues:

• Soothsayer's sightings
• Black cats and broken mirrors, by tradition
• Signs for good or ill
• Black cats and such
• Gathering clouds and such
• They can be read by the illiterate
• These late eclipses in the sun and moon portend no good to us in forecasts
• Signals from space, perhaps
• Signals of what's to come, to some
• Chilling signs