Hurricane Crossward

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Across
  1. 2. The phenomenon that provides the energy for hurricanes (7 letters)
  2. 4. The center of a hurricane (6 letters)
  3. 7. The category of hurricanes based on wind speed, from 1 to 5 (8 letters)
  4. 8. A storm system that can develop into a hurricane (5 letters)
Down
  1. 1. The scale used to classify hurricanes (5 letters)
  2. 3. What hurricanes rotate around (4 letters)
  3. 5. Where hurricanes typically form over (5 letters)
  4. 6. A measure of hurricane wind speed (6 letters)