forecast vs omen

forecast

verb
  • To foreshadow; to suggest something in advance. 

  • To estimate how something will be in the future. 

noun
  • exacta 

  • An estimation of a future condition. 

  • A prediction of the weather. 

omen

verb
  • To divine or predict from omens. 

  • To be an omen of. 

noun
  • A thing of prophetic significance. 

  • Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury. 

How often have the words forecast and omen occurred in a corpus of books? (source: Google Ngram Viewer )