KENT WOOD / SCIENCE PHOTO LIBRARY KENT WOOD / SCIENCE PHOTO LIBRARY
Bead lightning (a rare form of cloud-to-ground lightning which appears to break up into a string of short, bright sections) 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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