| 11. | On September 24, Fung-wong started to interact with a frontal system.
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| 12. | Unsettled weather will precede a frontal system as it moves east from the Dakotas.
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| 13. | The latest in a series of wet frontal systems will invade the Pacific Northwest.
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| 14. | A complex frontal system will move through the Plains states.
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| 15. | Flight directors were keeping close tabs Tuesday on a frontal system in the Midwest.
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| 16. | Thundersnow occurred widely on the 23rd with the passage of another strong frontal system.
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| 17. | Strong frontal system from the storm passed over continental Europe.
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| 18. | The western Plains and Rockies will be unsettled, as a complex frontal system tracks eastward.
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| 19. | North of the frontal system, lighter rain fell in the Northeast and Great Lakes region.
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| 20. | On approach, severe turbulence was again encountered due to the frontal system having reached Berlin.
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