Meteorology

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Across
  1. 3. divergent pressure system
  2. 4. Pressure change of 3.6 to 6.0 hPa in the preceding three hours
  3. 7. derived from the Latin meaning heap
  4. 11. Winds of 64 knots or more
  5. 13. layer of cloud
  6. 15. Winds of at least F8
  7. 16. convergent pressure system
  8. 18. 0.5 to 1.25m
  9. 19. cold front overtakes warm front
  10. 20. 1.25 to 2.5m
Down
  1. 1. less than 1000m
  2. 2. wind direction changing anti-clockwise
  3. 5. rain bearing cloud
  4. 6. visibility between 2 and 5 nm
  5. 8. tongue of relatively warm air between colder masses
  6. 9. wind direction changing clockwise
  7. 10. expected more than 12 hours from time of issue
  8. 12. pressure dropping more than 6.0hPa in the preceding 3 hours
  9. 13. moving at less than 15 knots
  10. 14. 48-55 knots
  11. 17. 2.5 to 4.0m