tropical storms

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Across
  1. 1. violent, whirling column of air in contact with the ground
  2. 3. the sound waves that follow after thunder
  3. 4. a body of air with horizontally uniform temperature
  4. 6. violet downdrafts that are concentrated in a local area
  5. 8. the channel of partially charged air
  6. 9. ranks tornadoes according to their destruction and wind speed
Down
  1. 2. a branched channel of positively charged particles
  2. 5. extremely powerful storms
  3. 7. the heat required to convert a solid into a liquid or a vapor