KENT WOOD / SCIENCE PHOTO LIBRARY KENT WOOD / SCIENCE PHOTO LIBRARY
Man silhouetted against an impressive lightning display from a summer thunderstorm over 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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