11. A plume of moist air will stream north through the Mississippi Valley to the central Great Lakes as breezes from the south quicken ahead of a weak cool front. 12. A weak cool front moving through the Ohio Valley will yield scattered showers from southern Illinois to northern Missouri Tuesday. 13. A weak cool front will graze northern New England and upstate New York, possibly accompanied by a brief thundershower. 14. A weak front accompanied by thundershowers will sweep off the Atlantic coast during the afternoon. 15. A weak front across northern and eastern New England will be the focus for patches of clouds and a few showers. 16. A weak front in the Dakotas will promote a few potent thunderstorms during the heat of the afternoon. 17. A weak front stretching from Wisconsin to Michigan will spark a few thunderstorms. 18. A weak front will approach the Northwestern Coast will clouds and some scattered showers. 19. A weak front will produce isolated showers in the Northwest. 20. A vigorous jet stream will push numerous weak fronts across the northern part of the country over the next several days. |