| 11. | A low pressure system pushed northward through the Ohio Valley on March 28.
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| 12. | A very strong low pressure system was approaching the northwest coast of California.
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| 13. | A low pressure system coming off the Pacific lowered temperatures in the Northwest.
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| 14. | A developing low pressure system will cause spotty afternoon showers across the Dakotas.
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| 15. | The adventurers'balloon got sucked into a low pressure system overnight in the Pacific.
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| 16. | Low pressure systems circulate cold air south and warm air north.
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| 17. | Gabrielle formed out of a low pressure system that quickly developed.
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| 18. | They then merged around a surface low pressure system and strengthened to become Danny.
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| 19. | On 18 January 1881, a low pressure system rapidly developed in the English Channel.
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| 20. | Before June, the jet stream repeatedly steered low pressure systems and fronts into Texas.
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