tropical storm vs windstorm

tropical storm

noun
  • A cyclone within the tropics, typically having its thunderclouds organized in a spiral shape with wind speeds on the surface between about 30 and 75 miles (60 - 120 km) per hour. 

windstorm

noun
  • A storm in which there are strong, violent winds but no precipitation. 

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