Transcript for March's Weather Madness
And tonight, March is living up to its billing. One day a lion. One day, a lamb. Despite the taste of spring weather, 89 million people across 14 states are back under winter watches and warnings, raising new fear about floods. As ABC's meteorologist, ginger zee, shows us. Reporter: A flood emergency in the mountain west, ice jams terrorizing towns from Montana to Wyoming. Rapid snowmelt leaving dozens stranded, as floods wash out roads. We are preparing for the worst, hoping for the best. Reporter: In Manderson, Wyoming, a drone capturing the immense scope of the ice jam. The flow runs up to 20 miles per hour with chunks weighing up to 200,000 pounds. So much of the issue, the rapid swing into spring. Look at how much of our nation was covered in snow just one week ago, almost 54%. Earlier today, that was cut by more than half. And while the surge of warmth is exiting, what goes up, is coming down. West of Denver, that snow, heading east tonight. We hit 65 degrees here in central park. You can see, spring fever gone wild behind me. But there are some ugly reminders of that harsh winter still around that have not and won't melt because we're about to get cold. And snow on the way for some folks, too, from Chicago to Detroit. Cleveland, you get it tonight, through early tomorrow. It's not just the three to six inches there for Chicago. The five to eight, likely in Detroit. But it's the wind on top of it. And then, interior new England, Wednesday night through Thursday, it really starts to push Vermont, Maine, places like that could get a foot-plus. Temperature swings, you have seen nothing compared to St. Louis, for example. At 81 today. By tomorrow, their high temperature, only in the 30s. And then, Philadelphia, doing the same thing. Today, we were right there in the 60s. By the time you reach Thursday, it's not going to be pretty. It will be in the upper 20s. Diane? Another whiplash. Thank you so much, ginger zee.
This transcript has been automatically generated and may not be 100% accurate.