During the day in the spring, the dryline is shoved eastward. It is felt, not seen. As it passes, the humidity drops, the skies clear, and the winds shift again. Wind aloft pushes the top of the dryline faster than its bottom, causing it to blanket the top of the warm, moist air mass. It forms a cap over the top of the warm, moist air. This is where the real atmospheric battle starts, about 1,000 feet from the surface.
