These pictures were shot by two photographers - Mike Olbinski and Blaine Coury - in Arizona. As you can see, a wall of dust is moving through the city of Phoenix in Arizona. According to the makers, "sandstorms like this happen during the region's monsoon season, which is underway. They occur over desert land and can reach thousands of feet into the air, spurred by strong winds. The dense cloud dramatically reduced visibility, grounding flights at a major airport and leaving thousands without electricity."

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