Lightning slices through rainy skies over Tucson, Arizona, in a five-minute time-exposure view from Tumamoc Hill. A regular feature of Arizona summers, such storms erupt when moist air flowing in from the Gulf of California collides with nearby mountains and is forced upward, where it condenses into towering thunderclouds.
Lightning slices through rainy skies over Tucson, Arizona, in a five-minute time-exposure view from Tumamoc Hill. A regular feature of Arizona summers, such storms erupt when moist air flowing in from the Gulf of California collides with nearby mountains and is forced upward, where it condenses into towering thunderclouds.
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