Dangers of the Big Thaw

Big warm up coast to coast mixed with rain is causing floods and dangerous chunks of ice to fall.
1:46 | 03/11/15

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Transcript for Dangers of the Big Thaw
We turn now to the extreme weather, and the new dangers tonight. Falling ice and flooding. And with this big warmup coast to coast, heavy rain and flood watches from the gulf all the way up through the Ohio valley. After so much snow, look at this. Time lapse from Wisconsin, showing the grass reappearing as the snow mets. But there is a new concern tonight. Chunks of meting ice slamming into cars, causing major damage. ABC chief meteorologist ginger zee is on cape cod tonight, where she's discovered something else. Ginger? Reporter: David, tonight, the beaches of cape cod look more like the arctic. And, yes, as beautiful as it is to spring into spring, it can be dangerous, too. Shattering into early spring, a sheet of ice eight inches thick sliding off the roof of this home, demolishing the windshield of a parked car. Behemoth chunks of ice falling off buildings, smashing through cars. The March sun, busting through the snowy shell of what was a hard winter. That epic 100-plus inches is now only a dirty foot or so around Boston. In Kentucky, after that heavy March snow, a drenching rain flooding streets in Louisville. Back on cape cod, those chunks of ice taller than most people are melting, too. The temperatures today reached the upper 40s and low 50s. So, yes, the ice is shrinking. And spring means more than just snow and ice. It means flooding. There are flash flood alerts from Louisiana and west Virginia. Going to be a problem in the coming days. Now, many of us boasting above average temperatures coast to coast. But look at rapid city, south Dakota, tomorrow, 25 degrees above average. And we're not talking 19.3%, that is the percent of our nation covered in snow. It is the least we've seen since mid-december. All right, ginger zee with us

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

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