A dazzling display of cloud-to-ground and aerial lightning discharges over the Tucson Mountains during a summer thunderstorm in Tucson, Arizona. The Arizona desert experiences many intense thunderstorms, with powerful gust fronts, heavy rain, hail and lightning, during the summer months. The storms are caused by moist air from the Pacific Baja or the Gulf of Mexico mixing with hot, dry air rising up from the heated desert floor.
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