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A dramatic twilight thunderstorm lit up and illuminated by internal lightning silhouettes the Santa Catalina Mountains while discharging multiple cloud to ground lightning strikes, summer, Tucson, AZ.  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.