cold days together, the arctic air is finally beginning to retreat. 240 million of us looking for the thaw. But we're learning, tonight, about some new hazards ahead, as the temperatures rise. A lot... See More
cold days together, the arctic air is finally beginning to retreat. 240 million of us looking for the thaw. But we're learning, tonight, about some new hazards ahead, as the temperatures rise. A lot of pipes are bursting. Watery roads. And the blizzard proving that storm is not going quietly. Who had the toughest day today? Abc's linzie janis starts us there. Reporter: The polar vortex may be retreating, but not before one final, howling blow. Blizzard conditions in western new york, shutting major highways. It's been horrible. I've seen plows like county plows in the ditches roads. Roads are just terrible. Reporter: In hamburg, just south buffalo, they're digging out drifts up to five feet. It's supposed to be 50 degrees by the weekend. What does that mean? Well, that means now we've got to watch out for flooding. Once the snow starts to melt, especially with the frozen ground, the water just starts running. Reporter: That wind and cold, turning the niagara river into more of a glacier. Ice breakers called in to help. Looks like something out of "national geographic." Reporter: For millions, the big thaw is causing big problems. A broken pipe in davenport, iowa, turned to ice in seconds. My tires are, like, literally frozen to the ground. Reporter: When pipes thaw, they can burst. And when the water melts, that's when it starts leaking. This massive water main break near atlanta this morning turned telephone poles into ice sculptures. It was kind of the recreation of the movie "frozen." Reporter: So many frozen fountains in the south. Even a pool. But as the snow and ice slowly disappear, an assessment of the damage. There's been at least 21 deaths. Plus, a huge economic impact. Child care costs, plus lost wages for employees who had to stay home. And home heating prices are expected to rise 13% over last year. Crews in hamburg have been digging out the town all day. And bringing giant truckloads of this dirty snow down to lake erie to be dumped. They hope by putting it here they will avoid flooding as the wig warm-up comes. Diane? Braving the cold for us. Thank you, linzie janis. How fast is the cold air retreating? Ginger zee with the forecast. Even faster than it came in. That's great news for a lot of people. We've all been suffering. A lot of folks. We looked at that length yesterday. 2,100 miles, if I get it right. And now, it's less than half of that. Closer to 1,000. So, it is going quickly. And the numbers go with it. Let me show you this, diane, because so many folks want to know, when do I start to be tolerable? It pushes to the north. And friday into saturday, we go above average. For so many folks, mid-atlantic and northeast. Boy, that looks great. So, who gets the prize for the longest time in the cold? The longest time, the biggest population. We're going to give it to green bay. Right after that game that so many of us were watching, they did not have the coldest nfl game. But they got close. And then, right after that point, they went sub zero and stayed there for 62 hours. 62 hours. Okay, ginger. Our thanks to you. And our hats go off to their true grit tonight, as we cover the nation's weather.
This transcript has been automatically generated and may not be 100% accurate.