Synoptic charts

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Across
  1. 1. Boundary where warm air advances over cold air (9)
  2. 6. Boundary where cold air advances beneath warm air (9)
  3. 8. Rotating low-pressure system in the atmosphere (7)
  4. 12. Area of low pressure, often bringing unsettled weather (10)
  5. 13. Elongated area of low pressure (6)
  6. 14. Shapes on a line indicating a Cold Front
  7. 15. Warm and cold fronts bring this
  8. 16. Extension of high pressure between two lows (5)
Down
  1. 2. Area of high pressure, usually bringing fine weather (11)
  2. 3. A cold front catches up and joins a warm front (8)
  3. 4. Boundary between two air masses of different temperatures (5)
  4. 5. Isobars close together indicate there will be more ____ (wind)
  5. 7. Area of descending air bringing calm and settled weather (12)
  6. 9. Force exerted by the weight of the atmosphere (8)
  7. 10. Line connecting points of equal atmospheric pressure (6)
  8. 11. Common pressure unit used on synoptic charts (9)