KENT WOOD / SCIENCE PHOTO LIBRARY KENT WOOD / SCIENCE PHOTO LIBRARY
Multiple cloud-to-ground lightning bolts are discharged from the leading edge of a summer thunderstorm on the right hand side of this time exposure photograph, taken 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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