Battle of the English Brains: Weather-themed Crossword Puzzle

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Across
  1. 3. Dense air vapor, reducing visibility
  2. 4. Strong air movement
  3. 5. A violent disturbance of the atmosphere
  4. 8. A powerful tropical storm
  5. 12. A prolonged period of excessively hot weather
  6. 13. Thick and dark clouds in the sky
  7. 14. High moisture content in the air
  8. 15. Gentle, light wind
Down
  1. 1. A sudden flash of light caused by electricity in the sky
  2. 2. Weather with bright sunlight
  3. 6. The degree of hotness or coldness of something
  4. 7. Weather phenomenon involving snow
  5. 9. Weather phenomenon involving water falling from the sky in liquid form
  6. 10. Cool or cold in temperature
  7. 11. The sound caused by lightning