| 11. | The crash destroyed or damaged several parts of the oxygen and pressure systems.
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| 12. | The balloonists got sucked into a low pressure system overnight in the Pacific.
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| 13. | A low pressure system pushed northward through the Ohio Valley on March 28.
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| 14. | A developing low pressure system will cause spotty afternoon showers across the Dakotas.
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| 15. | A very strong low pressure system was approaching the northwest coast of California.
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| 16. | Meanwhile, another potent low-pressure system will slam into the Pacific Northwest.
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| 17. | A high pressure system was expected to bring drier conditions over the weekend.
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| 18. | On Sunday, a sluggish low pressure system inched across the state.
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| 19. | Low pressure systems circulate cold air south and warm air north.
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| 20. | Auckland was under a high pressure system, which tends to keep winds down.
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