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WATCH: Massive dust storm overtakes city

Dust storms are a common sight in the Southwest during the monsoon, but some dust storms are bigger than others. This one was big enough to cover an entire city in Arizona! Find WeatherSphere elsewhere on the internet: http://www.weathersphere.co
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Not all dust storms are created equal. And this recent dust storm near Phoenix was so big it enveloped a city in dust and sand.

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Dust storms are a common sight during the Southwest United States' monsoon.

They form when winds from thunderstorms pick up sand, dust and dirt, forming a wall of dust and dropping visibility to near zero.