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