You've seen them on TV: mighty walls of dust barreling over the desert and covering the Phoenix area in dust.
Visibility drops, traffic halts, Facebook goes crazy, then everything outside is left with a coating of dust.
Watch the video above to learn from 12 News meteorologist Lindsay Riley about these powerful and incredible storms.
Get the latest on storms any time at 12News.com/Monsoon.
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GALLERY: Dust storm facts, safety and tips
GALLERY: Dust storm facts, safety and tips
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