weather puzzle

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Across
  1. 4. a big spark during a storm
  2. 7. vaporization
  3. 8. large body of air
  4. 9. ice pellets
  5. 10. moisture in the air
  6. 11. the tube part of a tornado
  7. 13. not official until it hits the ground
Down
  1. 1. difference in densities cause this.
  2. 2. wind and snow
  3. 3. when water reaches its dew point
  4. 5. in a low pressure system over warm water.
  5. 6. prevailing wind with rain
  6. 11. boundary between air masses
  7. 12. center of a hurricane
  8. 14. light rain