Lightning strike! A pair of cloud to ground lightning bolts plunge downward from the leading edge of a summer thunderstorm over metropolitanTucson, AZ in this time exposure photograph. The bolt on the right strikes the right hand corner of the lower building on the left. Lightning strikes cost property owners millions of dollars a year in property damage..Awesome and intense thunderstorms with powerful gust fronts, heavy rain, hail and lightning are common over the Arizona Desert during the summer months. Southwestern weather patterns create thunderstorms by pulling the fuel, moist air, either from the Pacific Baja side or the Gulf of Mexico and mixing it with the dry hot air rising up from the heated desert floor. Lightning is beautiful, but dangerous.