A huge dust storm rolled through Phoenix on Monday, leaving thousands without power and grounding flights.

At one point, the storm cut visibility to just a quarter-mile in metro Phoenix. Mother Bernae Boykin Hitesman was driving her son and daughter home from school on Monday afternoon when she had to pull over.

"I couldn't see my hand in front of my face if I put my hand outside," she told the Associated Press. "It was that bad."

Visibility had cleared up by Monday evening but more than 15,000 people were still without power by then, the AP reported.

This number has gone down significantly overnight, with just under 4,000 in Arizona still without power as of Tuesday morning, according to poweroutage.us.

This is a developing story - more to follow.

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