Giant Dust Storm Engulfs Phoenix

ABC News' Ginger Zee tracks the latest extreme weather across the country.
3:00 | 08/12/12

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Transcript for Giant Dust Storm Engulfs Phoenix
dust storm that engulfed phoenix this weekend. Tonight, ginger zee takes us inside the storm. It's totally dark out. Reporter: Swallowing cities whole. From blue to brown in seconds. Wow. Oh, shoot, that is scary. Reporter: Another blinding dust storm rolled through the phoenix area this weekend. Yeah, I'm surrounded by it. You see blue, blue, blue, bad, bad. Reporter: It's a monstrous swirl of dust. We have seen it from afar. What is it like inside? It got really, really dark really, really fast. The more I looked at the dust storm and I realize, it's massively huge. Reporter: Trapped inside a difficult. Highways come to an absolute halt. The it's moving wall of dust and debris can be miles long. When thunderstorms begin to die out and collapse, rain-cooled air rushes to ground. And that kicks up dust and sends it rolling. May seem like you may have seen more dust storms recently and one of the reasons is extreme heat. Phoenix is under heat warnings this week, 110 and above. That is extra fuel for the thunderstorms. Ginger zee, thank you. We have good now about congresswoman gabby giffords.

This transcript has been automatically generated and may not be 100% accurate.

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