YUMA, Ariz. (KYMA, KECY-TV) - A thunderstorm is a rain shower during which you hear thunder. Since thunder comes from lightning, all thunderstorms have lightning. Three basic ingredients are required for a thunderstorm to form, which include moisture, rising unstable air (air that keeps rising when given a nudge), and a lifting mechanism to provide the “nudge.” Most thunderstorms form in three stages which include the developing stage, when s…