The upper levels of the dryline act like the lid on a teakettle, topping the warm, moist air until the air mass becomes so warm and so humid that it no longer can be held back. It continually jabs until the dryline weakens. This is what the chasers come to see. The warm, moist current bursts through the dryline cap and blasts skyward at 100 miles per hour into the colder dry air above.
