hurricane vs unforeseen event

hurricane

noun
  • A severe tropical cyclone in the North Atlantic Ocean, Caribbean Sea, Gulf of Mexico, or in the eastern North Pacific off the west coast of Mexico, with winds of 119 km/h (74 miles per hour) or greater accompanied by rain, lightning, and thunder that sometimes moves into temperate latitudes. 

  • A wind scale for quite strong wind, stronger than a storm 

  • "full—triple-full—full" – an acrobatic maneuver consisting of three flips and five twists, with one twist on the first flip, three twists on the second flip, one twist on the third flip 

unforeseen event

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