What Really Happens Inside Nature's Wildest Storms?

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Across
  1. 3. A turbulent state.
  2. 5. Objects thrown through air.
  3. 7. Impossible to comprehend.
  4. 12. Violent or unsteady movement.
  5. 13. Extremely loud.
  6. 14. Inflexible; not giving way.
  7. 19. Inspiring fear or respect.
Down
  1. 1. Relating to a violent upheaval.
  2. 2. Sinking columns of air.
  3. 4. Rotating air column.
  4. 5. Seemingly reasonable.
  5. 6. Happens or occurs.
  6. 8. A powerful thunderstorm.
  7. 9. Based on personal accounts.
  8. 10. Uproar and confusion.
  9. 11. Wind speed or direction difference.
  10. 15. Causing weakness or harm.
  11. 16. Rising columns of air.
  12. 17. Visible cloud of a tornado.
  13. 18. A whirling mass of fluid.