Moisture From Dolores Sparks Off Major Flooding in Arizona

ABC News' Rob Marciano tracks the storms moving across the US.
2:46 | 07/20/15

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Transcript for Moisture From Dolores Sparks Off Major Flooding in Arizona
Let's get right to the severe weather tonight, taking lives. The southwest hammered. Major flooding in Arizona. It started like this. You can see the dark clouds moving over Phoenix. Remnants of tropical storm Dolores. And then this happened. Monsoon rain triggering flash floods. Washing out this mountain road. And lightning here in Michigan, being seen coast-to-coast. Severe storms on the move at this hour. 23 million people at risk tonight. Rob Marciano with it all. Reporter: A wild weekend of deadly weather across the country. In the southwest, leftovers from hurricane Dolores causing this. Oh, my god. This is in wickenburg! Reporter: Flash flooding in Arizona. Debris-filled water rushing through this town outside Phoenix. About two feet of water. Reporter: Quickly receding, but leaving behind a muddy mess. Fortunately, no injuries there. But flooding claiming three lives overnight near Cincinnati, Ohio. This is what's left of one family's mobile home, destroyed. A pregnant mother and two children, killed in raging floodwaters. Her brother trying to cope. She loved her kids to death. She was a good mother. Reporter: Four to five inches of rain falling in just a couple of hours, sending the creek near their home surging, taking everything with it. Her fiance and two other children, one clinging to a tree, miraculously survived. And lightning lighting up the midwest skies and proving fatal in Colorado. A 31-year-old woman struck and killed while hiking near salida. And another person hit while working in his yard in golden Wednesday. He had no pulse. He was not breathing. Reporter: Cora Jean leenheer, rushing to her husband jerry. His hat and shirt in Tatters, his body lifeless. I just started doing chest compressions right away, and praying. Reporter: After 20 minutes of cpr, he took a breath. I just started crying. I was just delighted that he was back. Reporter: And he's going to be okay. That wife jumping into action. Rob, potentially dangerous weather on the way? Colorado could see thunderstorms with lightning. That area, plus Ohio, Pennsylvania, New York, new England, strong thunderstorms expected through the evening hour. Tomorrow, across the Ohio river valley, affecting St. Louis, Indianapolis and Louisville. But the heat remains. And it's been stiflingly hot. And that will continue. Temperatures feeling like they're up and over 100 degrees. Try to stay cool. And the desert southwest, still impacted by what's left of Dolores.

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

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