21.   In the wake of the front, cooler and less humid air will flow into the northern Mississippi valley.

22.   Initially, moist air flows gently onshore from the Gulf of Mexico.

23.   Mild, dry air will flow into the Middle Atlantic States and Southwest New England as a cold front moves slowly offshore.

24.   Much cooler air will flow into the West behind a strong cold front crossing the eastern Rockies.

25.   Noticeably less humid air will flow into the Northeast as a cold front pushes farther offshore.

26.   On Tuesday, showers will spread as far north as central Pennsylvania as humid air flows inland from the western Atlantic.

27.   Polar air will flow back into the Northeast on Saturday as low pressure strengthens near Nova Scotia.

28.   Scattered showers will reach the Southeast as mild and moist air flows north from the Gulf of Mexico.

29.   Since air flows downward in the hab, crumbs and other small objects will collect at the base of walls, in filters like those in a swimming pool.

30.   Sultry weather will cover the South as tropical air flows north from the Gulf of Mexico.