hot water vs natural disaster

hot water

noun
  • A dangerous situation; trouble. 

  • fierce criticism 

  • Used other than figuratively or idiomatically: see hot, water. 

natural disaster

noun
  • The emergency situation that is the consequence of such an event. 

  • Any natural phenomenon that causes great damage and loss of life. 

How often have the words hot water and natural disaster occurred in a corpus of books? (source: Google Ngram Viewer )