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