A heat wave occurs when a system of high atmospheric pressure moves into an area and lasts for several days. In such a high-pressure system, air from upper levels of our atmosphere is pulled toward the ground, where it becomes compressed and increases in temperature. High-pressure systems force air downward. This force prevents air near the ground from rising. The sinking air acts like a lid or a cap. It traps warm ground air in place. Without rising air there is nothing to prevent the hot air from getting hotter.
Comments