11. Organized areas of thunderstorm activity not only reinforce pre-existing frontal zones , but they can outrun cold fronts. 12. On September 15 and 16, the regiment left Plancher les M�nes for another frontal zone near Ch�lons-en-Champagne. 13. The remnant circulation elongated in advance of a frontal zone , and it dissipated late on December 9. 14. Rain and embedded thunder will plague the interior Northeast on Tuesday as a frontal zone crosses the region. 15. Farther east, clouds and scattered showers will occur near the frontal zone from northern Alabama to the Carolinas. 16. A 155 mile ( 250 km ) swath of showers and thunderstorms was positioned across the frontal zone . 17. Isidore downgraded to a tropical depression on October 1, and was absorbed in a frontal zone later that day. 18. Broken middle clouds will streak southeast from the frontal zone , dimming the sun at times across the eastern Plains. 19. A "'dynamical frontal zone "'sits at the southern limit of the saline subtropical waters on the western sides of basins. 20. On August 7 the storm turned eastward, due to the influence of a large approaching mid to upper-level frontal zone .
