Extreme weather

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Across
  1. 3. the occurrence of a natural electrical discharge
  2. 4. pellets of frozen rain
  3. 5. also known as an electrical storm
  4. 7. strong winds, arid conditions
Down
  1. 1. heavy snow, ice, cold temperatures
  2. 2. an overflow of a large amount of water
  3. 6. A violently rotating column of air