21. Showers and thunderstorms will escort a warm front moving across the upper Middle West. 22. A warm front approaching the Northwest will trigger showers along Washington's coast. 23. Clouds will spread through the Northeast as a warm front approaches from the southwest. 24. Isolated thunderstorms will occur near a developing warm front in the middle Mississippi Valley. 25. Some light rain will race ahead of a warm front into the western Appalachians. 26. The sultry air mass behind the warm front will be ripe for thunderstorm development. 27. Showers and thunderstorms will attend a warm front as it moves into the Northeast. 28. Thundershowers will attend a warm front in the Great Lakes and western Ohio Valley. 29. The Northwest coast will become damp as rain returns ahead of a warm front . 30. A warm front just came in from Canada.
